may not be a breakthrough in filmmaking , 
(ROOT (S (VP (MD may) (RB not) (VP (VB be) (NP (NP (DT a) (NN breakthrough)) (PP (IN in) (NP (NN filmmaking)))))) (, ,)))
(ROOT (S (VP (MD ) (RB ) (VP (VB ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (NN )))))) (, )))