महाभारतः mahābhārataḥ - book-5, chapter-50, verse-37

येन राजा महावीर्यः प्रविश्यान्तःपुरं पुरा ।
वासुदेवसहायेन जरासंधो निपातितः ॥३७॥

37. yena rājā mahāvīryaḥ praviśyāntaḥpuraṁ purā ,
vāsudevasahāyena jarāsaṁdho nipātitaḥ.

37. yena rājā mahāvīryaḥ praviśya antaḥpuraṃ
purā vāsudevasahāyena jarāsaṃdhaḥ nipātitaḥ

37. Formerly, by whom the very powerful King Jarāsaṃdha was killed, after that one had entered his inner chambers with the assistance of Vāsudeva (Kṛṣṇa).

Words meanings summery:

• येन (yena) - by whom, by which

• राजा (rājā) - king

• महावीर्यः (mahāvīryaḥ) - very powerful, mighty, very strong

• प्रविश्य (praviśya) - having entered

• अन्तःपुरं (antaḥpuraṁ) - inner apartment, harem, zenana

• पुरा (purā) - formerly, previously, in ancient times

• वासुदेवसहायेन (vāsudevasahāyena) - by one having Vāsudeva as helper, with the help of Vāsudeva

• जरासंधः (jarāsaṁdhaḥ) - Jarāsaṃdha (name of a king)

• निपातितः (nipātitaḥ) - struck down, killed, overthrown

Words meanings and morphology

येन (yena) - by whom, by which

(pronoun)

Instrumental, masculine, singular of yad

yad - which, what, who

राजा (rājā) - king

(noun)

Nominative, masculine, singular of rājan

rājan - king, sovereign

महावीर्यः (mahāvīryaḥ) - very powerful, mighty, very strong

(adjective)

Nominative, masculine, singular of mahāvīrya

mahāvīrya - very powerful, mighty, heroic

Compound type : bahuvrihi (mahā+vīrya)

• mahā – great, large, mighty
  adjective
• vīrya – valor, strength, heroism, power
  noun (neuter)

प्रविश्य (praviśya) - having entered

(indeclinable)

absolutive

Derived from verb root viś with upasarga pra.

Prefix: pra

Root: viś (class 6)

अन्तःपुरं (antaḥpuraṁ) - inner apartment, harem, zenana

(noun)

Accusative, neuter, singular of antaḥpura

antaḥpura - inner apartment, harem, royal seraglio

Compound type : tatpurusha (antar+pura)

• antar – within, inside, inner
  indeclinable
• pura – city, fortress, house, residence
  noun (neuter)

पुरा (purā) - formerly, previously, in ancient times

(indeclinable)

वासुदेवसहायेन (vāsudevasahāyena) - by one having Vāsudeva as helper, with the help of Vāsudeva

(adjective)

Instrumental, masculine, singular of vāsudevasahāya

vāsudevasahāya - having Vāsudeva as a helper, assisted by Vāsudeva

Compound type : bahuvrihi (vāsudeva+sahāya)

• vāsudeva – son of Vasudeva, Kṛṣṇa
  proper noun (masculine)
• sahāya – helper, assistant, companion
  noun (masculine)

जरासंधः (jarāsaṁdhaḥ) - Jarāsaṃdha (name of a king)

(proper noun)

Nominative, masculine, singular of jarāsaṃdha

jarāsaṁdha - Jarāsaṃdha (name of a powerful king of Magadha, adversary of Kṛṣṇa)

निपातितः (nipātitaḥ) - struck down, killed, overthrown

(adjective)

Nominative, masculine, singular of nipātita

nipātita - struck down, thrown down, killed, overthrown

Past Passive Participle

Derived from verb root pat with upasarga ni, causative stem PĀTayati, then past passive participle.

Prefix: ni

Root: pat (class 1)