alternating with lots of sloppiness 
(ROOT (S (VP (VBG alternating) (PP (IN with) (NP (NP (NNS lots)) (PP (IN of) (NP (NN sloppiness))))))))
(ROOT (S (VP (VBG ) (PP (IN ) (NP (NP (NNS )) (PP (IN ) (NP (NN ))))))))