it might not be 1970s animation , 
(ROOT (S (NP (PRP it)) (VP (MD might) (RB not) (VP (VB be) (NP (NNS 1970s) (NN animation)))) (, ,)))
(ROOT (S (NP (PRP )) (VP (MD ) (RB ) (VP (VB ) (NP (NNS ) (NN )))) (, )))