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.