the characters are too simplistic to maintain interest 
(ROOT (S (NP (DT the) (NNS characters)) (VP (VBP are) (ADJP (RB too) (JJ simplistic) (S (VP (TO to) (VP (VB maintain) (NP (NN interest)))))))))
(ROOT (S (NP (DT ) (NNS )) (VP (VBP ) (ADJP (RB ) (JJ ) (S (VP (TO ) (VP (VB ) (NP (NN )))))))))