Complex sentence: Mr. Garrison tells the students to move in pairs and hold hands.Cartmantries to pair up with Kenny, who chooses Craig.Cartman tries to pair up with Stan, but he pairs up with Wendy (whom he specifically refers to as his girlfriend).
Split into simpler sentences: Mr. Garrison tells the students to move in pairs and hold hands. Cartman then tries to pair up with Kenny, who chooses Craig.Cartman tries to pair up with Stan, but he pairs up with Wendy (whom he specifically refers to as his girlfriend).