Complex sentence: He pretends he is dying and asks Abed (Danny Pudi) to film a documentary on the "final" moments of his life which in fact is revenge--in the form of psychological torture--on the rest of the group for not taking him seriously.
Split into simpler sentences: He pretends he is dying and asks Abed (Danny Pudi) to film a documentary on the "final" moments of his life. Unbeknownst to them, the documentary is in fact revenge--in the form of psychological torture--on the rest of the group for not taking him seriously.