becomes too heavy for the plot . 
(ROOT (S (VP (VBZ becomes) (ADJP (RB too) (JJ heavy) (PP (IN for) (NP (DT the) (NN plot))))) (. .)))
(ROOT (S (VP (VBZ ) (ADJP (RB ) (JJ ) (PP (IN ) (NP (DT ) (NN ))))) (. )))