strong filmmaking requires a clear sense of purpose 
(ROOT (S (NP (JJ strong) (NN filmmaking)) (VP (VBZ requires) (NP (NP (DT a) (JJ clear) (NN sense)) (PP (IN of) (NP (NN purpose)))))))
(ROOT (S (NP (JJ ) (NN )) (VP (VBZ ) (NP (NP (DT ) (JJ ) (NN )) (PP (IN ) (NP (NN )))))))