a convincing impersonation here of a director enjoying himself immensely 
(ROOT (NP (NP (DT a) (JJ convincing) (NN impersonation)) (ADVP (RB here)) (PP (IN of) (NP (NP (DT a) (NN director)) (VP (VBG enjoying) (NP (PRP himself)) (ADVP (RB immensely)))))))
(ROOT (NP (NP (DT ) (JJ ) (NN )) (ADVP (RB )) (PP (IN ) (NP (NP (DT ) (NN )) (VP (VBG ) (NP (PRP )) (ADVP (RB )))))))