trying to set the women 's liberation movement back 20 years 
(ROOT (S (VP (VBG trying) (S (VP (TO to) (VP (VB set) (NP (NP (DT the) (NNS women) (POS 's)) (NN liberation) (NN movement)) (ADVP (RB back)) (NP (CD 20) (NNS years))))))))
(ROOT (S (VP (VBG ) (S (VP (TO ) (VP (VB ) (NP (NP (DT ) (NNS ) (POS )) (NN ) (NN )) (ADVP (RB )) (NP (CD ) (NNS ))))))))