योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-124, verse-23

मरीबकेऽकरोद्वर्षे वर्षाण्यत्र चतुर्दश ।
विद्याधरत्वं पाश्चात्यः स विद्याधरविद्यया ॥ २३ ॥

marībake'karodvarṣe varṣāṇyatra caturdaśa ,
vidyādharatvaṃ pāścātyaḥ sa vidyādharavidyayā 23

23. marībake akarot varṣe varṣāṇi atra caturdaśa
vidyādharatvaṃ pāścātyaḥ saḥ vidyādharavidyayā

23. saḥ pāścātyaḥ vidyādharavidyayā vidyādharatvaṃ
(ca) atra marībake varṣe caturdaśa varṣāṇi akarot

23. Here in the Marībaka region, he, the latter one, spent fourteen years, having attained the state of a Vidyādhara through the knowledge of Vidyādharas.

Words meanings summery:

• मरीबके (marībake) - in Marībaka, in the Marībaka region

• अकरोत् (akarot) - he spent (time) (he did, he made, he performed, he spent)

• वर्षे (varṣe) - in the region (in the year, in the region, in the rainy season)

• वर्षाणि (varṣāṇi) - years (of time) (years, rains)

• अत्र (atra) - here, in this place

• चतुर्दश (caturdaśa) - fourteen

• विद्याधरत्वं (vidyādharatvaṁ) - the state of a Vidyādhara, the nature of a Vidyādhara

• पाश्चात्यः (pāścātyaḥ) - the latter person (mentioned in the context) (the westerner, one from the west, the latter one)

• सः (saḥ) - he (referring to the pāścātya) (he, that (one))

• विद्याधरविद्यया (vidyādharavidyayā) - by the knowledge or magic of Vidyādharas

Words meanings and morphology

मरीबके (marībake) - in Marībaka, in the Marībaka region

(proper noun)

Locative, neuter, singular of marībaka

marībaka - a specific region or country

अकरोत् (akarot) - he spent (time) (he did, he made, he performed, he spent)

(verb)

3rd person , singular, active, aorist (luṅ) of kṛ

Aorist 3rd person singular, active voice

Root: kṛ (class 8)

वर्षे (varṣe) - in the region (in the year, in the region, in the rainy season)

(noun)

Locative, neuter, singular of varṣa

varṣa - year, rain, region, country

वर्षाणि (varṣāṇi) - years (of time) (years, rains)

(noun)

Accusative, neuter, plural of varṣa

varṣa - year, rain, region

अत्र (atra) - here, in this place

(indeclinable)

चतुर्दश (caturdaśa) - fourteen

(numeral)

Note: Functions as an adjective for varṣāṇi

विद्याधरत्वं (vidyādharatvaṁ) - the state of a Vidyādhara, the nature of a Vidyādhara

(noun)

Accusative, neuter, singular of vidyādharatva

vidyādharatva - the state, condition, or nature of being a Vidyādhara

`tva` suffix forming abstract noun from `vidyādhara`

Compound type : tatpuruṣa (vidyādhara+tva)

• vidyādhara – a class of celestial beings, holder of knowledge or magic
  noun (masculine)
  compound: vidyā (knowledge) + dhara (holder)
• tva – suffix for forming abstract nouns, meaning '-ness', '-hood'
  suffix (neuter)

पाश्चात्यः (pāścātyaḥ) - the latter person (mentioned in the context) (the westerner, one from the west, the latter one)

(noun)

Nominative, masculine, singular of pāścātya

pāścātya - western, belonging to the west, later, younger

Derived from paścāt (after/behind/west)

सः (saḥ) - he (referring to the pāścātya) (he, that (one))

(pronoun)

Nominative, masculine, singular of tad

tad - that, he, she, it

Demonstrative pronoun, masculine nominative singular

विद्याधरविद्यया (vidyādharavidyayā) - by the knowledge or magic of Vidyādharas

(noun)

Instrumental, feminine, singular of vidyādharavidyā

vidyādharavidyā - the knowledge or magic of Vidyādharas

compound

Compound type : tatpuruṣa (vidyādhara+vidyā)

• vidyādhara – a class of celestial beings, holder of knowledge or magic
  noun (masculine)
• vidyā – knowledge, learning, magic, spell
  noun (feminine)