Complex sentence: Roy lets his temper get the best of him in most situations, and after accidentally killing an opposing teams mascot during a game, he's banned (again) from coaching college level basketball until he can show that he can control his anger.
Split into simpler sentences: Roy lets his temper get the best of him in most situations. After causing a mishap with a mascot, the board bans McCormick from collegiate basketball until he can show that he can control his anger.