Complex sentence: Stine reveals that Slappy has cut the town off from the rest of the world but before they can try something else, they're attacked by Will Blake's werewolf form from "The Werewolf Of Fever Swamp".
Split into simpler sentences: Stine reveals that Slappy has cut the town off from the rest of the world. Before they can try something else, they're attacked by Will Blake's werewolf form from "The Werewolf Of Fever Swamp".