fails to do justice to either effort in three hours of screen time 
(ROOT (S (VP (VBZ fails) (S (VP (TO to) (VP (VB do) (NP (NN justice)) (PP (IN to) (NP (CC either) (NN effort))) (PP (IN in) (NP (NP (CD three) (NNS hours)) (PP (IN of) (NP (NN screen) (NN time)))))))))))
(ROOT (S (VP (VBZ ) (S (VP (TO ) (VP (VB ) (NP (NN )) (PP (IN ) (NP (CC ) (NN ))) (PP (IN ) (NP (NP (CD ) (NNS )) (PP (IN ) (NP (NN ) (NN )))))))))))