has made a decent ` intro ' documentary 
(ROOT (VP (VBZ has) (VP (VBN made) (NP (DT a) (JJ decent) (`` `) (NN intro) ('' ') (NN documentary)))))
(ROOT (VP (VBZ ) (VP (VBN ) (NP (DT ) (JJ ) (`` ) (NN ) ('' ) (NN )))))