much of a mixed bag , with enough negatives 
(ROOT (NP (NP (NP (JJ much)) (PP (IN of) (NP (DT a) (VBN mixed) (NN bag)))) (, ,) (PP (IN with) (NP (JJ enough) (NNS negatives)))))
(ROOT (NP (NP (NP (JJ )) (PP (IN ) (NP (DT ) (VBN ) (NN )))) (, ) (PP (IN ) (NP (JJ ) (NNS )))))