anvavātsīt tam īśvaraḥ

sah-it; asayista-lay; abdhi-salile-on the waters of the Causal Ocean; anda-kosah-egg; niratmakah-in an unconscious state; sagram-a little more than; vai-in fact; varsa-sahasram-a thousand years; anvavatsit-became situated; tam-in the egg; isvarah-the Lord.