Complex sentence: Fiz was disgusted when the principal didn't scold Kenzie for his behaviour and admitted that he was dating Kenzie's mother, outraging Fiz and she announced that Chesney was going to be home-schooled.
Split into simpler sentences: Fiz was disgusted when the principal didn't scold Kenzie for his behaviour. He admitted that he was seeing Kenzie's mother which outraged Fiz and she announced that Chesney was going to be home-schooled.