sei puruṣa - that Personality of Godhead, Mahā-Viṣṇu; ananta-koṭi brahmāṇḍa - millions and trillions of brahmāṇḍas, or universes; sṛjiyā - after creating; eka-eka - in each one of them; mūrtye - in a form; praveśilā - entered; bahu mūrti hañā - becoming many forms.

“After creating the total number of universes, which are unlimited, Mahā-Viṣṇu expanded Himself into unlimited forms and entered into each of them.