( ( While ( ( studies ( in animals ) ) ( demonstrate ( that ( ( vitamin E ) ( decreases atherosclerosis ) ) ) ) ) ) ( , ( ( ( supplementation studies ) ( in ( humans ( ( investigating ( the effects ) ) ( on ( heart ( ( attacks and ) strokes ) ) ) ) ) ) ) ( ( have ( resulted ( in ( conflicting outcomes ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN While) (S (NP (NP (NNS studies)) (PP (IN in) (NP (NNS animals)))) (VP (VBP demonstrate) (SBAR (IN that) (S (NP (NNP vitamin) (NNP E)) (VP (VBZ decreases) (NP (NNS atherosclerosis)))))))) (, ,) (NP (NP (NN supplementation) (NNS studies)) (PP (IN in) (NP (NP (NNS humans)) (VP (VBG investigating) (NP (DT the) (NNS effects)) (PP (IN on) (NP (NN heart) (NNS attacks) (CC and) (NNS strokes))))))) (VP (VBP have) (VP (VBN resulted) (PP (IN in) (NP (VBG conflicting) (NNS outcomes))))) (. .)))
While studies in animals demonstrate that vitamin E decreases atherosclerosis, supplementation studies in humans investigating the effects on heart attacks and strokes have resulted in conflicting outcomes.
(ROOT (S (NP (DT A) (NN heart) (NN attack) (CC or) (NN stroke)) (VP (VBZ is) (ADVP (RB often)) (NP (NP (DT a) (NN result)) (PP (IN of) (NP (JJ untreated) (NNS atherosclerosis))))) (. .)))