of the rotting underbelly of middle america 
(ROOT (PP (IN of) (NP (NP (DT the) (VBG rotting) (NN underbelly)) (PP (IN of) (NP (JJ middle) (NNP america))))))
(ROOT (PP (IN ) (NP (NP (DT ) (VBG ) (NN )) (PP (IN ) (NP (JJ ) (NNP ))))))