the pianist is polanski 's best film . 
(ROOT (S (NP (DT the) (NN pianist)) (VP (VBZ is) (NP (NP (NN polanski) (POS 's)) (JJS best) (NN film))) (. .)))
(ROOT (S (NP (DT ) (NN )) (VP (VBZ ) (NP (NP (NN ) (POS )) (JJS ) (NN ))) (. )))