is good at being the ultra-violent gangster wannabe 
(ROOT (VP (VBZ is) (ADJP (JJ good) (PP (IN at) (S (VP (VBG being) (NP (DT the) (JJ ultra-violent) (NN gangster) (NN wannabe))))))))
(ROOT (VP (VBZ ) (ADJP (JJ ) (PP (IN ) (S (VP (VBG ) (NP (DT ) (JJ ) (NN ) (NN ))))))))