Complex sentence: Surya Siddhanta explicitly states that its planets are incarnations of God and are therefore deities, and the material universe vanishes during the night of Brahma when Surya Siddhantic Sun continues moving, otherwise Brahma will not know that His night has elapsed.
Split into simpler sentences: Surya Siddhanta explicitly states that its planets are incarnations of God and are therefore deities. The whole material universe vanishes during the night of Brahma when Surya Siddhantic Sun continues moving, otherwise Brahma will not know that His night has elapsed.