Complex sentence: At that moment, Wally leads the Prouds and the Penny clone on a perilous journey to the other side of the island, where he claims there is someone who can answer their questions.
Split into simpler sentences: At that moment, Wally leads the Prouds and the Penny clone on a perilous journey to the other side of the island. Wally tells them that there is someone who can answer their questions.