अन्वयः

सत्याभिसन्धेन bound by his promise, त्रिवर्गम् dharma, artha and kama (righteousness, attainment of riches or worldly prosperity and pleasure considered as three of the four ends of life, the fourth one being moksha), अनुतिष्ठता by the strict followerm, तेन by the king Dasaratha, श्रेष्ठा best of cities, सा पुरी that city of Ayodhya, इन्द्रेण by Indra, अमरावती Amaravati, इव like, पालिता ruled.

M N Dutt

As Indra rules Amarāvatī, that one firm in promise, and following duty, profit, and pleasure, ruled that best of cities.

Summary

King Dasaratha, who always kept his word and followed dharma, attained prosperity and pleasure in equal measure by righteous means ruled that best of the cities as Indra ruled Amaravati.

पदच्छेदः

तेन	तद् (३.१)
सत्याभिसंधेन	सत्य–अभिसंधा (३.१)
त्रिवर्गम्	त्रि–वर्ग (२.१)
अनुतिष्ठता	अनुतिष्ठत् (√अनु-स्था + शतृ, ३.१)
पालिता	पालित (√पालय् + क्त, १.१)
सा	तद् (१.१)
पुरी	पुरी (१.१)
श्रेष्ठेन्द्रेण	श्रेष्ठ–इन्द्र (३.१)
इवामरावती	इव (अव्ययः)–अमरावती (१.१)

छन्दः

अनुष्टुप् [८]

छन्दोविश्लेषणम्

१	२	३	४	५	६	७	८
ते	न	स	त्या	भि	सं	धे	न
त्रि	व	र्ग	म	नु	ति	ष्ठ	ता
पा	लि	ता	सा	पु	री	श्रे	ष्ठे
न्द्रे	ण	इ	वा	म	रा	व	ती