Complex sentence: At school, Cartman is laughed at by Butters, is discriminated against by the very people he himself inspired to despise Gingers, and is forced to join them in eating in the hallway despite his attempts to convince them that he is still who he was.
Split into simpler sentences: At school, Cartman is laughed at by Butters, and faces discrimination from the very people he himself convinced to despise Gingers. He is forced to join the gingers in eating in the hallway despite his attempts to convince them that he is still who he was.