a distinctly mixed bag , the occasional bursts of sharp writing alternating with lots of sloppiness 
(ROOT (NP (NP (DT a) (ADJP (RB distinctly) (VBN mixed)) (NN bag)) (, ,) (NP (NP (NP (DT the) (JJ occasional) (NNS bursts)) (PP (IN of) (NP (JJ sharp) (NN writing)))) (VP (VBG alternating) (PP (IN with) (NP (NP (NNS lots)) (PP (IN of) (NP (NN sloppiness)))))))))
(ROOT (NP (NP (DT ) (ADJP (RB ) (VBN )) (NN )) (, ) (NP (NP (NP (DT ) (JJ ) (NNS )) (PP (IN ) (NP (JJ ) (NN )))) (VP (VBG ) (PP (IN ) (NP (NP (NNS )) (PP (IN ) (NP (NN )))))))))