महाभारतः mahābhārataḥ - book-15, chapter-21, verse-2

गान्धारीसहितो धीमानभिनन्द्य यथाविधि ।
कार्त्तिक्यां कारयित्वेष्टिं ब्राह्मणैर्वेदपारगैः ॥२॥

2. gāndhārīsahito dhīmānabhinandya yathāvidhi ,
kārttikyāṁ kārayitveṣṭiṁ brāhmaṇairvedapāragaiḥ.

2. gāndhārīsahitaḥ dhīmān abhinandya yathāvidhi
kārttikyām kārayitvā iṣṭim brāhmaṇaiḥ vedapāragaiḥ

2. gāndhārīsahitaḥ dhīmān yathāvidhi abhinandya
kārttikyām vedapāragaiḥ brāhmaṇaiḥ iṣṭim kārayitvā

2. Accompanied by Gāndhārī, the wise (king Dhṛtarāṣṭra), having properly honored (the Pāṇḍavas), then caused a Vedic ritual to be performed on the full moon day of Kārttika by Brahmins who had mastered the Vedas.

Words meanings summery:

• गान्धारीसहितः (gāndhārīsahitaḥ) - accompanied by Gāndhārī

• धीमान् (dhīmān) - the wise king Dhṛtarāṣṭra (wise, intelligent, sagacious)

• अभिनन्द्य (abhinandya) - having properly honored (the Pāṇḍavas) (having honored, having greeted, having pleased)

• यथाविधि (yathāvidhi) - according to rule, properly, ritually, as prescribed

• कार्त्तिक्याम् (kārttikyām) - on the full moon day of the Kārttika month (October-November) (on the Kārttikī (full moon day of Kārttika))

• कारयित्वा (kārayitvā) - having caused to be done/performed

• इष्टिम् (iṣṭim) - a Vedic ritual, an offering

• ब्राह्मणैः (brāhmaṇaiḥ) - by Brahmins

• वेदपारगैः (vedapāragaiḥ) - by Brahmins who were learned in the Vedas (by those who have mastered the Vedas)

Words meanings and morphology

गान्धारीसहितः (gāndhārīsahitaḥ) - accompanied by Gāndhārī

(adjective)

Nominative, masculine, singular of gāndhārīsahita

gāndhārīsahita - accompanied by Gāndhārī

Tatpuruṣa compound: gāndhārī (proper noun) + sahita (accompanied)

Compound type : tatpuruṣa (gāndhārī+sahita)

• gāndhārī – name of a princess from Gāndhāra, wife of Dhṛtarāṣṭra
  proper noun (feminine)
• sahita – accompanied, joined with, furnished with
  adjective
  Past Passive Participle
  from sa (with) + √hi (to send, to move)
  Prefix: sa
  Root: hi (class 5)

Note: nominative singular masculine, modifying Dhṛtarāṣṭra

धीमान् (dhīmān) - the wise king Dhṛtarāṣṭra (wise, intelligent, sagacious)

(adjective)

Nominative, masculine, singular of dhīmat

dhīmat - wise, intelligent, sagacious

possessive suffix -mat

Note: nominative singular masculine of dhīmat, modifying Dhṛtarāṣṭra

अभिनन्द्य (abhinandya) - having properly honored (the Pāṇḍavas) (having honored, having greeted, having pleased)

(indeclinable)

root nand (1st class, bhvādi)

Prefix: abhi

Root: nand (class 1)

Note: absolutive (gerund) form from √nand with prefix abhi

यथाविधि (yathāvidhi) - according to rule, properly, ritually, as prescribed

(indeclinable)

avyayībhāva compound: yathā (as, according to) + vidhi (rule, precept)

कार्त्तिक्याम् (kārttikyām) - on the full moon day of the Kārttika month (October-November) (on the Kārttikī (full moon day of Kārttika))

(noun)

Locative, feminine, singular of kārttikī

kārttikī - the full moon day in the month of Kārttika

feminine form of Kārttika, referring to the full moon day

कारयित्वा (kārayitvā) - having caused to be done/performed

(indeclinable)

Causative Absolutive

causative stem kāraya- + absolutive suffix -itvā

Root: kṛ (class 8)

Note: causative absolutive from √kṛ

इष्टिम् (iṣṭim) - a Vedic ritual, an offering

(noun)

Accusative, feminine, singular of iṣṭi

iṣṭi - a Vedic offering, a minor ritual or sacrifice

from √yaj (to sacrifice, to worship)

Root: yaj (class 1)

ब्राह्मणैः (brāhmaṇaiḥ) - by Brahmins

(noun)

Instrumental, masculine, plural of brāhmaṇa

brāhmaṇa - a Brahmin, a member of the priestly class

वेदपारगैः (vedapāragaiḥ) - by Brahmins who were learned in the Vedas (by those who have mastered the Vedas)

(adjective)

Instrumental, masculine, plural of vedapāraga

vedapāraga - one who has crossed over (mastered) the Vedas, learned in the Vedas

Tatpuruṣa compound: veda (Veda) + pāraga (gone across, skilled in)

Compound type : tatpuruṣa (veda+pāraga)

• veda – Veda (sacred knowledge, scripture)
  noun (masculine)
  Root: vid (class 2)
• pāraga – one who has gone to the other shore, skilled in, master of
  adjective
  from pāra (other shore) + √gam (to go)
  Root: gam (class 1)

Note: instrumental plural masculine, modifying 'brāhmaṇaiḥ'