, combined with so much first-rate talent ... could have yielded such a flat , plodding picture 
(ROOT (S (, ,) (VP (VBN combined) (PP (IN with) (NP (ADJP (RB so) (JJ much)) (NML (JJ first) (HYPH -) (NN rate)) (NN talent)))) (, ...) (VP (MD could) (VP (VB have) (VP (VBN yielded) (NP (PDT such) (DT a) (JJ flat) (, ,) (VBG plodding) (NN picture)))))))
(ROOT (S (, ) (VP (VBN ) (PP (IN ) (NP (ADJP (RB ) (JJ )) (NML (JJ ) (HYPH ) (NN )) (NN )))) (, ) (VP (MD ) (VP (VB ) (VP (VBN ) (NP (PDT ) (DT ) (JJ ) (, ) (VBG ) (NN )))))))