( ( ( Blood flow ) ( to ( the skin ) ) ) ( ( ( increases , ) ( ( causing ( a ( decreased ( blood flow ) ) ) ) ( to ( the ( vital organs ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NN Blood) (NN flow)) (PP (TO to) (NP (DT the) (NN skin)))) (VP (VBZ increases) (, ,) (S (VP (VBG causing) (NP (DT a) (VBN decreased) (NN blood) (NN flow)) (PP (TO to) (NP (DT the) (JJ vital) (NNS organs)))))) (. .)))
Blood flow to the skin increases, causing a decreased blood flow to the vital organs.
(ROOT (S (NP (NNP Blood)) (VP (VBP flow) (VP (VB decrease) (SBAR (WHADVP (WRB when)) (S (NP (NN blood) (NNS vessels)) (VP (VBP constrict)))))) (. .)))