undergo radical changes when it suits the script 
(ROOT (S (VP (VB undergo) (NP (JJ radical) (NNS changes)) (SBAR (WHADVP (WRB when)) (S (NP (PRP it)) (VP (VBZ suits) (NP (DT the) (NN script))))))))
(ROOT (S (VP (VB ) (NP (JJ ) (NNS )) (SBAR (WHADVP (WRB )) (S (NP (PRP )) (VP (VBZ ) (NP (DT ) (NN ))))))))