Complex sentence: When they arrive in Cityville, however, Cousin Mel and her attorney, I.M. Slime, quickly come up with a plan to kidnap Grandma, and after Santa explains to Austin Bucks what happened, Jake and Quincy discover that Grandma has gone missing again.
Split into simpler sentences: When they arrive in Cityville, however, Cousin Mel and her attorney, I.M. Slime, quickly come up with a plan to kidnap Grandma. After Santa explains to Austin Bucks what happened, Jake and Quincy discover that Grandma has gone missing again.