( ( ( The decrease ) ( in ( mean ( arterial ( blood pressure ) ) ) ) ) ( ( was ( caused ( ( ( ( by ( a vasodilation ) ) and ) not ) ( by ( a ( reduced ( cardiac output ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN decrease)) (PP (IN in) (NP (JJ mean) (JJ arterial) (NN blood) (NN pressure)))) (VP (VBD was) (VP (VBN caused) (PP (PP (IN by) (NP (DT a) (NN vasodilation))) (CC and) (RB not) (PP (IN by) (NP (DT a) (VBN reduced) (JJ cardiac) (NN output)))))) (. .)))
The decrease in mean arterial blood pressure was caused by a vasodilation and not by a reduced cardiac output.
(ROOT (S (S (VP (VBG Reducing) (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NP (NNS molecules)) (PP (IN in) (NP (DT a) (JJ rigid) (NN container)))))))) (VP (VBZ causes) (NP (NN pressure)) (S (VP (TO to) (VP (VB decrease))))) (. .)))