the lousy lead performances ... keep the movie from ever reaching the comic heights it obviously desired . 
(ROOT (S (NP (DT the) (JJ lousy) (NN lead) (NNS performances)) (, ...) (VP (VB keep) (NP (DT the) (NN movie)) (PP (IN from) (S (ADVP (RB ever)) (VP (VBG reaching) (NP (NP (DT the) (NN comic) (NNS heights)) (SBAR (S (NP (PRP it)) (ADVP (RB obviously)) (VP (VBD desired))))))))) (. .)))
(ROOT (S (NP (DT ) (JJ ) (NN ) (NNS )) (, ) (VP (VB ) (NP (DT ) (NN )) (PP (IN ) (S (ADVP (RB )) (VP (VBG ) (NP (NP (DT ) (NN ) (NNS )) (SBAR (S (NP (PRP )) (ADVP (RB )) (VP (VBD ))))))))) (. )))