i 've seen some bad singer-turned actors , 
(ROOT (S (NP (PRP i)) (VP (VBP 've) (VP (VBN seen) (NP (DT some) (JJ bad) (NML (NN singer) (HYPH -) (VBN turned)) (NNS actors)))) (, ,)))
(ROOT (S (NP (PRP )) (VP (VBP ) (VP (VBN ) (NP (DT ) (JJ ) (NML (NN ) (HYPH ) (VBN )) (NNS )))) (, )))