महाभारतः mahābhārataḥ - book-5, chapter-147, verse-12

यवीयांसं ततः पूरुं पुत्रं स्ववशवर्तिनम् ।
राज्ये निवेशयामास विधेयं नृपसत्तमः ॥१२॥

12. yavīyāṁsaṁ tataḥ pūruṁ putraṁ svavaśavartinam ,
rājye niveśayāmāsa vidheyaṁ nṛpasattamaḥ.

12. yavīyāṃsam tataḥ pūrum putram svavaśavartinam
rājye niveśayāmāsa vidheyam nṛpasattamaḥ

12. tataḥ nṛpasattamaḥ vidheyam svavaśavartinam
yavīyāṃsam putram pūrum rājye niveśayāmāsa

12. Then, that excellent king (nṛpasattama) installed his youngest son, Puru, who was obedient (svavaśavartin) and submissive (vidheya), in the kingdom (rājya).

Words meanings summery:

• यवीयांसम् (yavīyāṁsam) - Puru, the youngest son (the youngest, younger)

• ततः (tataḥ) - then, thereafter

• पूरुम् (pūrum) - Yayati's youngest son, Puru (Puru (name of a king/son))

• पुत्रम् (putram) - his (Yayati's) son (son)

• स्ववशवर्तिनम् (svavaśavartinam) - obedient to Yayati's will (acting according to one's own will, obedient)

• राज्ये (rājye) - in the kingdom, in the reign

• निवेशयामास (niveśayāmāsa) - he installed, he placed, he caused to enter

• विधेयम् (vidheyam) - obedient to his father's command (obedient, compliant, submissive)

• नृपसत्तमः (nṛpasattamaḥ) - Yayati, the best of kings (best of kings, excellent king)

Words meanings and morphology

यवीयांसम् (yavīyāṁsam) - Puru, the youngest son (the youngest, younger)

(adjective)

Accusative, masculine, singular of yavīyas

yavīyas - younger, youngest

Comparative/superlative form of yuvan (young).

ततः (tataḥ) - then, thereafter

(indeclinable)

पूरुम् (pūrum) - Yayati's youngest son, Puru (Puru (name of a king/son))

(proper noun)

Accusative, masculine, singular of pūru

pūru - Puru (a legendary king, son of Yayati)

पुत्रम् (putram) - his (Yayati's) son (son)

(noun)

Accusative, masculine, singular of putra

putra - son, child

स्ववशवर्तिनम् (svavaśavartinam) - obedient to Yayati's will (acting according to one's own will, obedient)

(adjective)

Accusative, masculine, singular of svavaśavartin

svavaśavartin - acting according to one's own will, independent, obedient (when contextually implied to higher will)

Compound type : tatpuruṣa (sva+vaśa+vartin)

• sva – own, one's own
  pronoun
• vaśa – will, power, control, subjection
  noun (masculine)
• vartin – being, existing, acting, residing, following
  adjective (masculine)
  Agent noun from root vṛt
  Root: vṛt (class 1)

राज्ये (rājye) - in the kingdom, in the reign

(noun)

Locative, neuter, singular of rājya

rājya - kingdom, sovereignty, dominion

निवेशयामास (niveśayāmāsa) - he installed, he placed, he caused to enter

(verb)

3rd person , singular, active, perfect (Lit) of niveśayāmāsa

Causative, Periphrastic Perfect

Periphrastic perfect form of the causative of ni-viś.

Prefix: ni

Root: viś (class 6)

विधेयम् (vidheyam) - obedient to his father's command (obedient, compliant, submissive)

(adjective)

Accusative, masculine, singular of vidheya

vidheya - to be managed, to be regulated, obedient, subservient

Gerundive

Gerundive derived from the root dhā with prefix vi.

Prefix: vi

Root: dhā (class 3)

नृपसत्तमः (nṛpasattamaḥ) - Yayati, the best of kings (best of kings, excellent king)

(noun)

Nominative, masculine, singular of nṛpasattama

nṛpasattama - best among kings, excellent king

Compound type : tatpuruṣa (nṛpa+sattama)

• nṛpa – king, protector of men
  noun (masculine)
• sattama – best, most excellent (superlative)
  adjective (masculine)
  Superlative form of sat (good, excellent).