Complex sentence: The first significant appearance of the word "Dvija" occurs in the Manu Smriti (166 mentions) composed between 2nd to 3rd century CE. The Yajnavalkya Smriti, composed in 4th or 5th-century CE mentions the word less often (40 times).
Split into simpler sentences: The first significant appearance of the word "Dvija" occurs in the Manusmriti (166 mentions). Yet Yajnavalkya Smriti, composed in 4th or 5th-century CE mentions the word less often (40 times).