a film that loses sight of its own story . 
(ROOT (NP (NP (DT a) (NN film)) (SBAR (WHNP (WDT that)) (S (VP (VBZ loses) (NP (NP (NN sight)) (PP (IN of) (NP (PRP$ its) (JJ own) (NN story))))))) (. .)))
(ROOT (NP (NP (DT ) (NN )) (SBAR (WHNP (WDT )) (S (VP (VBZ ) (NP (NP (NN )) (PP (IN ) (NP (PRP$ ) (JJ ) (NN ))))))) (. )))