( ( ( ( ( ( ( The ( first ( leading cause ) ) ) ( of ( death ( in ( the ( United States ) ) ) ) ) ) ( is ( heart disease ) ) ) , ) and ) ( ( the ( third ( leading cause ) ) ) ( is stroke ) ) ) . )
(ROOT (S (S (NP (NP (DT The) (JJ first) (VBG leading) (NN cause)) (PP (IN of) (NP (NP (NN death)) (PP (IN in) (NP (DT the) (NNP United) (NNPS States)))))) (VP (VBZ is) (NP (NN heart) (NN disease)))) (, ,) (CC and) (S (NP (DT the) (JJ third) (JJ leading) (NN cause)) (VP (VBZ is) (NP (NN stroke)))) (. .)))
The first leading cause of death in the United States is heart disease, and the third leading cause is stroke.
(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))))) (. .)))