've seen the hippie-turned-yuppie plot before 
(ROOT (S (VP (VBP 've) (VP (VBN seen) (NP (DT the) (NML (NML (NML (NN hippie)) (HYPH -) (VP (VBN turned) (HYPH -) (ADJP (JJ yuppie))))) (NN plot)) (ADVP (RB before))))))
(ROOT (S (VP (VBP ) (VP (VBN ) (NP (DT ) (NML (NML (NML (NN )) (HYPH ) (VP (VBN ) (HYPH ) (ADJP (JJ ))))) (NN )) (ADVP (RB ))))))