( ( The substance ) ( ( may ( ( cause effects ) ( on ( the ( cardiovascular system ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN substance)) (VP (MD may) (VP (VB cause) (NP (NNS effects)) (PP (IN on) (NP (DT the) (JJ cardiovascular) (NN system))))) (. .)))
The substance may cause effects on the cardiovascular system.
(ROOT (S (NP (DT The) (JJ cardiovascular) (NN system)) (VP (VBZ transports) (NP (JJ many) (NNS substances)) (PP (TO to) (CC and) (IN from) (NP (NP (NNS cells)) (PP (IN throughout) (NP (DT the) (NN body)))))) (. .)))