Complex sentence: Bart proves his point by smashing the end of Bob's shoe with a croquet mallet, causes Bob to scream in pain and yell at him for hitting his foot and the kids are shocked to hear the words uttered on the security tape.
Split into simpler sentences: Bart proves his point by smashing the end of his shoe with a croquet mallet. This causes Bob to scream in pain and yell at him for hitting his foot and the kids are shocked to hear the words uttered on the security tape.