Complex sentence: Surrounded by satanists, Preston pulls out his cross, which then appears to transform into a snake, and is discarded by Shatner's character, and he is promptly captured by the Satanic followers of Corbis.
Split into simpler sentences: Surrounded by satanists, Preston pulls out his cross, which then appears to transform into a snake, and is discarded by Preston. He is promptly captured by the Satanic followers of Corbis.