( ( ( The ( leading cause ) ) ( of ( death ( in ( United States ) ) ) ) ) ( ( is ( diseases ( of heart ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (VBG leading) (NN cause)) (PP (IN of) (NP (NP (NN death)) (PP (IN in) (NP (NNP United) (NNPS States)))))) (VP (VBZ is) (NP (NP (NNS diseases)) (PP (IN of) (NP (NN heart))))) (. .)))
The leading cause of death in United States is diseases of heart.
(ROOT (S (NP (NNP Heart) (NN disease)) (VP (VBZ is) (NP (NP (DT the) (VBG leading) (NN cause)) (PP (IN of) (NP (NN death))) (PP (IN in) (NP (DT the) (VBN united) (NNS states))))) (. .)))