अन्वयः

तत्र there, बहवः many, ऋषयः ascetics, शरदां शतम् for hundreds of years, तपसा with austerities, विहृत्य having roamed about, कपालशिरसा सह with the skulls on their heads, दिवम् heaven, आरूढाः have ascended.

M N Dutt

There innumerable saints with the hair of their heads rendered white like skulls, having spent hundreds of years, have through austerities ascended heaven.

Summary

On the Chitrakuta mountain many ascetics wandered about (lived) for hundreds of years carrying on penance. In the process they became so much emaciated that they looked as if they were left (only) with the skulls on their heads. (In the end) they ascended heaven.

पदच्छेदः

ऋषयस्	ऋषि (१.३)
तत्र	तत्र (अव्ययः)
बहवो	बहु (१.३)
विहृत्य	विहृत्य (√वि-हृ + ल्यप्)
शरदां	शरद् (६.३)
शतम्	शत (२.१)
तपसा	तपस् (३.१)
दिवम्	दिव् (२.१)
आरूढाः	आरूढ (√आ-रुह् + क्त, १.३)
कपालशिरसा	कपालशिरस् (३.१)
सह	सह (अव्ययः)

छन्दः

अनुष्टुप् [८]

छन्दोविश्लेषणम्

१	२	३	४	५	६	७	८
ऋ	ष	य	स्त	त्र	ब	ह	वो
वि	हृ	त्य	श	र	दां	श	तम्
त	प	सा	दि	व	मा	रू	ढाः
क	पा	ल	शि	र	सा	स	ह