the riveting performances by the incredibly flexible cast 
(ROOT (NP (NP (DT the) (VBG riveting) (NNS performances)) (PP (IN by) (NP (DT the) (ADJP (RB incredibly) (JJ flexible)) (NN cast)))))
(ROOT (NP (NP (DT ) (VBG ) (NNS )) (PP (IN ) (NP (DT ) (ADJP (RB ) (JJ )) (NN )))))