he 's afraid of his best-known creation 
(ROOT (S (NP (PRP he)) (VP (VBZ 's) (ADJP (JJ afraid) (PP (IN of) (NP (PRP$ his) (ADJP (RBS best) (HYPH -) (VBN known)) (NN creation)))))))
(ROOT (S (NP (PRP )) (VP (VBZ ) (ADJP (JJ ) (PP (IN ) (NP (PRP$ ) (ADJP (RBS ) (HYPH ) (VBN )) (NN )))))))