it may not be a great piece of filmmaking , 
(ROOT (S (NP (PRP it)) (VP (MD may) (RB not) (VP (VB be) (NP (NP (DT a) (JJ great) (NN piece)) (PP (IN of) (NP (NN filmmaking)))))) (, ,)))
(ROOT (S (NP (PRP )) (VP (MD ) (RB ) (VP (VB ) (NP (NP (DT ) (JJ ) (NN )) (PP (IN ) (NP (NN )))))) (, )))