Complex sentence: When the family comes downstairs at 7:01 A.M., Bart makes up a story about how he caught a burglary in progress, and the suspect made off with the tree and all of the family's presents.
Split into simpler sentences: When the family comes downstairs at 7:01 A.M., Bart lies to them. He makes up a story about how he caught a burglary in progress, and the suspect made off with the tree and all of the family's presents.