अन्वयः

महात्मन: of highly courageous, राघवस्य Rama's, तेन महता कर्मणा by that great act, सचराचरम् all the animate and inanimate beings, सदेवर्षिगणम् including groups of gods and sages, त्रैलोक्यम् in three worlds, तुष्टम् wellpleased.

M N Dutt

Thereupon assured by Agni as to the sinlessness of Sītā, Rāma became exceedingly pleased, and was honoured by all the deities. And at that great act of Rāma's the three worlds with all that was mobile and immobile in them, along with the sages and gods, were well pleased with the mighty-souled Rāghava.

Summary

All the animate and inanimate beings, gods and sages in the three worlds were very pleased at this noble deed of the great Rama.

पदच्छेदः

कर्मणा	कर्मन् (३.१)
तेन	तद् (३.१)
महता	महत् (३.१)
त्रैलोक्यं	त्रैलोक्य (१.१)
सचराचरम्	सचराचर (१.१)
सदेवर्षिगणं	स (अव्ययः)–देवर्षि–गण (२.१)
तुष्टं	तुष्ट (√तुष् + क्त, १.१)
राघवस्य	राघव (६.१)
महात्मनः	महात्मन् (६.१)

छन्दः

अनुष्टुप् [८]

छन्दोविश्लेषणम्

१	२	३	४	५	६	७	८
क	र्म	णा	ते	न	म	ह	ता
त्रै	लो	क्यं	स	च	रा	च	रम्
स	दे	व	र्षि	ग	णं	तु	ष्टं
रा	घ	व	स्य	म	हा	त्म	नः