( ( Heart disease ) ( ( is ( ( the ( leading cause ) ) ( of ( death ( ( ( in ( the ( United States ) ) ) and ) ( in ( many ( other countries ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Heart) (NN disease)) (VP (VBZ is) (NP (NP (DT the) (VBG leading) (NN cause)) (PP (IN of) (NP (NP (NN death)) (PP (PP (IN in) (NP (DT the) (NNP United) (NNPS States))) (CC and) (PP (IN in) (NP (JJ many) (JJ other) (NNS countries)))))))) (. .)))
Heart disease is the leading cause of death in the  United States and in many other countries.
(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))))) (. .)))