महाभारतः mahābhārataḥ - book-9, chapter-36, verse-51

ततः कुञ्जान्बहून्कृत्वा संनिवृत्ता सरिद्वरा ।
ऋषीणां पुण्यतपसां कारुण्याज्जनमेजय ॥५१॥

51. tataḥ kuñjānbahūnkṛtvā saṁnivṛttā saridvarā ,
ṛṣīṇāṁ puṇyatapasāṁ kāruṇyājjanamejaya.

51. tataḥ kuñjān bahūn kṛtvā saṃnivṛttā saridvarā
ṛṣīṇām puṇyatapasām kāruṇyāt janamejaya

51. janamejaya tataḥ saridvarā bahūn kuñjān
kṛtvā puṇyatapasām ṛṣīṇām kāruṇyāt saṃnivṛttā

51. Then, O Janamejaya, the best of rivers, having created many groves, turned back out of compassion for the sages whose austerities (tapas) were meritorious.

Words meanings summery:

• ततः (tataḥ) - then, thereafter, from that

• कुञ्जान् (kuñjān) - groves, thickets

• बहून् (bahūn) - many, numerous

• कृत्वा (kṛtvā) - having made, having done, having created

• संनिवृत्ता (saṁnivṛttā) - returned, turned back completely

• सरिद्वरा (saridvarā) - best of rivers, excellent river

• ऋषीणाम् (ṛṣīṇām) - of the sages, of the seers

• पुण्यतपसाम् (puṇyatapasām) - of those whose penance (tapas) is meritorious, of those with sacred austerities (tapas)

• कारुण्यात् (kāruṇyāt) - out of compassion, by compassion

• जनमेजय (janamejaya) - O Janamejaya

Words meanings and morphology

ततः (tataḥ) - then, thereafter, from that

(indeclinable)

कुञ्जान् (kuñjān) - groves, thickets

(noun)

Accusative, masculine, plural of kuñja

kuñja - grove, arbour, thicket, bower

बहून् (bahūn) - many, numerous

(adjective)

Accusative, masculine, plural of bahu

bahu - many, much, numerous, abundant

कृत्वा (kṛtvā) - having made, having done, having created

(indeclinable)

Absolutive

Absolutive form from the root kṛ.

Root: kṛ (class 8)

संनिवृत्ता (saṁnivṛttā) - returned, turned back completely

(adjective)

Nominative, feminine, singular of saṃnivṛtta

saṁnivṛtta - turned back, returned, ceased, stopped

Past Passive Participle

Derived from the root vṛt with prefixes sam and ni.

Prefixes: sam+ni

Root: vṛt (class 1)

सरिद्वरा (saridvarā) - best of rivers, excellent river

(noun)

Nominative, feminine, singular of saridvarā

saridvarā - best of rivers, excellent river

Compound type : Ṣaṣṭhī Tatpuruṣa (sarit+varā)

• sarit – river, stream
  noun (feminine)
• varā – best, excellent, prominent (feminine form of vara)
  adjective (feminine)

ऋषीणाम् (ṛṣīṇām) - of the sages, of the seers

(noun)

Genitive, masculine, plural of ṛṣi

ṛṣi - sage, seer, inspired poet, Vedic sage

पुण्यतपसाम् (puṇyatapasām) - of those whose penance (tapas) is meritorious, of those with sacred austerities (tapas)

(adjective)

Genitive, masculine, plural of puṇyatapas

puṇyatapas - having meritorious penance, whose austerity is sacred

Compound type : Bahuvrīhi (puṇya+tapas)

• puṇya – meritorious, virtuous, sacred, pure
  adjective (neuter)
• tapas – religious austerity, penance, heat, spiritual power (tapas)
  noun (neuter)

कारुण्यात् (kāruṇyāt) - out of compassion, by compassion

(noun)

Ablative, neuter, singular of kāruṇya

kāruṇya - compassion, pity, mercy

जनमेजय (janamejaya) - O Janamejaya

(proper noun)

Vocative, masculine, singular of janamejaya

janamejaya - Janamejaya (a proper name, king in the Mahābhārata)