does n't sustain a high enough level of invention 
(ROOT (S (VP (VBZ does) (RB n't) (VP (VB sustain) (NP (NP (DT a) (ADJP (JJ high) (JJ enough)) (NN level)) (PP (IN of) (NP (NN invention))))))))
(ROOT (S (VP (VBZ ) (RB ) (VP (VB ) (NP (NP (DT ) (ADJP (JJ ) (JJ )) (NN )) (PP (IN ) (NP (NN ))))))))