a directorial tour de force by bernard rose , ivans 
(ROOT (NP (NP (DT a) (NN directorial) (NN tour) (NNP de) (NN force)) (PP (IN by) (NP (NP (NNP bernard) (NN rose)) (, ,) (NP (NNS ivans))))))
(ROOT (NP (NP (DT ) (NN ) (NN ) (NNP ) (NN )) (PP (IN ) (NP (NP (NNP ) (NN )) (, ) (NP (NNS ))))))