udatiṣṭhad asau virāṭ

tatah-then; tena-by the Lord; anuviddhebhyah-from these seven principles, roused into activity; yuktebhyah-united; andam-an egg; acetanam-unintelligent; utthitam-arose; purusah-Cosmic Being; yasmat-from which; udatisthat-appeared; asau-that; virat-celebrated.