is simply not enough of interest onscreen to sustain its seventy-minute running time 
(ROOT (VP (VBZ is) (ADVP (RB simply)) (RB not) (ADJP (JJ enough) (PP (IN of) (NP (NN interest))) (ADVP (RB onscreen)) (S (VP (TO to) (VP (VB sustain) (NP (PRP$ its) (NML (CD seventy) (HYPH -) (NN minute)) (VBG running) (NN time))))))))
(ROOT (VP (VBZ ) (ADVP (RB )) (RB ) (ADJP (JJ ) (PP (IN ) (NP (NN ))) (ADVP (RB )) (S (VP (TO ) (VP (VB ) (NP (PRP$ ) (NML (CD ) (HYPH ) (NN )) (VBG ) (NN ))))))))