Complex sentence: She is excited to meet a master thief, and suggests that he rob her mother, whose jewelry is insured, except the diamond dog, which must not be taken-even though this would be an obvious giveaway.
Split into simpler sentences: She is excited to meet a master thief, and suggests that he rob her mother, whose jewelry is insured, except the diamond dog. But she insists that the dog must not be taken-even though this would be an obvious giveaway.