अन्वयः

अस्मिन् पार्थिवे this king, पुत्रशोकेन out of grief over (seperation from) his son, पञ्चत्वम् dissolution into the five elements (death), आपन्ने having attained, या that night, नः for us, वर्षशतोपमा like a hundred years, शर्वरी such night, दुःखम् sorrowful, अतीता passed.

M N Dutt

Then facing the royal priest, the eminent Vasistha, they said, "That night that had appeared like to an hundred years has at last been painfully passed.

Summary

While king Dasaratha died on account of grief over (separation from) his son and rejoined the five elements, the sorrowful night seemed like a hundred years for us. (commented the assembly of ministers).

पदच्छेदः

अतीता	अतीत (√अति-इ + क्त, १.१)
शर्वरी	शर्वरी (१.१)
दुःखं	दुःख (२.१)
या	यद् (१.१)
नो	मद् (४.३)
वर्षशतोपमा	वर्ष–शत–उपम (१.१)
अस्मिन्	इदम् (७.१)
पञ्चत्वम्	पञ्चत्व (२.१)
आपन्ने	आपन्न (√आ-पद् + क्त, ७.१)
पुत्रशोकेन	पुत्र–शोक (३.१)
पार्थिवे	पार्थिव (७.१)

छन्दः

अनुष्टुप् [८]

छन्दोविश्लेषणम्

१	२	३	४	५	६	७	८
अ	ती	ता	श	र्व	री	दुः	खं
या	नो	व	र्ष	श	तो	प	मा
अ	स्मि	न्प	ञ्च	त्व	मा	प	न्ने
पु	त्र	शो	के	न	पा	र्थि	वे