the variety of tones in spielberg 's work 
(ROOT (NP (NP (DT the) (NN variety)) (PP (IN of) (NP (NNS tones))) (PP (IN in) (NP (NP (NNP spielberg) (POS 's)) (NN work)))))
(ROOT (NP (NP (DT ) (NN )) (PP (IN ) (NP (NNS ))) (PP (IN ) (NP (NP (NNP ) (POS )) (NN )))))