It sounds simple, by South Park standards: The 200th episode was about a class-action lawsuit by 200 celebrities defamed by the show — er, the town of South Park. They were led by Tom Cruise, who demanded to see the Prophet Muhammad. But there was also the reappearance of “Jennifer Lopez,” a hand-puppet wielded by Cartman in the manner of Senor Wences. And ultimately, the half-hour was a cliffhanger about the true identity of Cartman’s father.Gee, maybe it wasn’t so simple after all.