dvijā: brahmins, pravargyam Pravargya (a particular part of the sacrifice), śāstrata: according to scriptures, kṛtvā having done, tathaiva and, upasadam Upasada (another part of the sacrifice), vidhivat as per tradition, adhikam still other, sarvaṅ karma ceremonies, śāstrata: according to ordinance, cakru: performed.
Brahmins performed pravargya and upasada and other ceremonies as per the scriptures and traditions.