Complex sentence: Mayor Corey and Mr. McKnight then arrive to apologize to Ben for using his ancestor in their little publicity stunt, explaining that they had to use the witch to boost the town's economy because of lack of tourists.
Split into simpler sentences: Mayor Corey and Mr. McKnight then arrive to apologize to Ben for using his ancestor in their little publicity stunt. They explained that they had to use the witch to boost the towns economy because of lack of tourists.