महाभारतः mahābhārataḥ - book-3, chapter-197, verse-2

साङ्गोपनिषदान्वेदानधीते द्विजसत्तमः ।
स वृक्षमूले कस्मिंश्चिद्वेदानुच्चारयन्स्थितः ॥२॥

2. sāṅgopaniṣadānvedānadhīte dvijasattamaḥ ,
sa vṛkṣamūle kasmiṁścidvedānuccārayansthitaḥ.

2. sāṅgopaniṣadān vedān adhīte dvijasattamaḥ | saḥ
vṛkṣamūle kasmiṃścit vedān uccārayan sthitaḥ

2. That excellent Brahmin (dvijasattama) studied the Vedas along with their auxiliary texts (aṅgas) and Upaniṣads. He was once staying at the root of a certain tree, reciting the Vedas.

Words meanings summery:

• साङ्गोपनिषदान् (sāṅgopaniṣadān) - along with their auxiliary texts (aṅgas) and Upaniṣads (along with the Aṅgas and Upaniṣads)

• वेदान् (vedān) - the Vedas

• अधीते (adhīte) - studied (studies, recites)

• द्विजसत्तमः (dvijasattamaḥ) - that excellent Brahmin (dvijasattama) (best of Brahmins, most excellent twice-born)

• सः (saḥ) - he (he, that)

• वृक्षमूले (vṛkṣamūle) - at the root of a tree

• कस्मिंश्चित् (kasmiṁścit) - at a certain (in a certain, at a certain)

• वेदान् (vedān) - the Vedas

• उच्चारयन् (uccārayan) - reciting (uttering, reciting, pronouncing)

• स्थितः (sthitaḥ) - was staying (stood, situated, remained, was)

Words meanings and morphology

साङ्गोपनिषदान् (sāṅgopaniṣadān) - along with their auxiliary texts (aṅgas) and Upaniṣads (along with the Aṅgas and Upaniṣads)

(adjective)

Accusative, masculine, plural of sāṅgopaniṣad

sāṅgopaniṣad - along with the Aṅgas (auxiliary sciences of the Vedas) and Upaniṣads

Compound: sa-aṅga-upaniṣad. 'sa' (with) + 'aṅga' (limb/auxiliary) + 'upaniṣad'

Compound type : bahuvrihi (sa+aṅga+upaniṣad)

• sa – with, together with
  indeclinable
  Prefix/indeclinable
• aṅga – limb, body, part; auxiliary science (of the Veda)
  noun (neuter)
• upaniṣad – secret doctrine, esoteric teaching, Upaniṣad (a class of Vedic philosophical texts)
  noun (feminine)
  from upa-ni-sad (to sit near)
  Prefixes: upa+ni
  Root: sad (class 1)

Note: This adjective modifies 'vedān'.

वेदान् (vedān) - the Vedas

(noun)

Accusative, masculine, plural of veda

veda - sacred knowledge, Veda (scriptures of Hinduism)

Accusative plural masculine of veda.

Root: vid (class 2)

अधीते (adhīte) - studied (studies, recites)

(verb)

3rd person , singular, middle, present (lat) of adhi-i

Present Middle

Present 3rd person singular middle (ātmanepada) of root i with prefix adhi.

Prefix: adhi

Root: i (class 2)

द्विजसत्तमः (dvijasattamaḥ) - that excellent Brahmin (dvijasattama) (best of Brahmins, most excellent twice-born)

(noun)

Nominative, masculine, singular of dvijasattama

dvijasattama - best among the twice-born (Brahmins)

Compound: dvija + sattama (superlative of sat)

Compound type : tatpurusha (dvija+sattama)

• dvija – twice-born (Brahmin, Kṣatriya, Vaiśya); a bird; a tooth
  noun (masculine)
  from dvi (two) + ja (born)
  Root: jan (class 4)
• sattama – best, most excellent (superlative of sat)
  adjective (masculine)
  Superlative suffix -tama added to sat (good, existing)

Note: Refers to Kauśika.

सः (saḥ) - he (he, that)

(pronoun)

Nominative, masculine, singular of tad

tad - that, he, she, it

Nominative singular masculine form of the pronoun tad.

Note: Base form of sa before 'vṛkṣamūle'.

वृक्षमूले (vṛkṣamūle) - at the root of a tree

(noun)

Locative, neuter, singular of vṛkṣamūla

vṛkṣamūla - root of a tree, base of a tree

Compound: vṛkṣa (tree) + mūla (root). Locative singular neuter.

Compound type : tatpurusha (vṛkṣa+mūla)

• vṛkṣa – tree
  noun (masculine)
• mūla – root, base, origin
  noun (neuter)

कस्मिंश्चित् (kasmiṁścit) - at a certain (in a certain, at a certain)

(pronoun)

Locative, neuter, singular of kaścid

kaścid - someone, a certain person/thing

Locative singular masculine/neuter of the indefinite pronoun kaścid (kim+cid).

Note: Agrees with 'vṛkṣamūle' (neuter locative).

वेदान् (vedān) - the Vedas

(noun)

Accusative, masculine, plural of veda

veda - sacred knowledge, Veda (scriptures of Hinduism)

Accusative plural masculine of veda.

Root: vid (class 2)

उच्चारयन् (uccārayan) - reciting (uttering, reciting, pronouncing)

(adjective)

Nominative, masculine, singular of uccārayat

uccārayat - uttering, pronouncing, reciting

Present Active Participle

Present active participle (nominative singular masculine) from the causal form of root car (to move) with prefix ut. Causal: cārayati (to cause to move, to utter).

Prefix: ut

Root: car (class 1)

Note: Modifies the implied subject 'he'.

स्थितः (sthitaḥ) - was staying (stood, situated, remained, was)

(adjective)

Nominative, masculine, singular of sthita

sthita - stood, standing, situated, existing, staying

Past Passive Participle

Past passive participle (nominative singular masculine) of root sthā (to stand).

Root: sthā (class 1)

Note: Functions here like a finite verb 'he was' or 'he stood'.