Complex sentence: On misadventures of their own, they decide to go for the ultimate 100-point score, Mona Lott, the new French teacher, but when they are unable to get a shot at her, they end up in the unforgiving clutches of the principal.
Split into simpler sentences: On misadventures of their own, they decide to go for the ultimate 100-point score, Mona Lott, the new French teacher. But when they're unable to get a shot at her, they end up in the unforgiving clutches of the principal.