( ( The ( circulatory system ) ) ( ( transports ( ( ( needed materials ) ( such ( as ( ( food ( , ( oxygen ( , ( and water ) ) ) ) ) ( ( ( to cells ) and ) ( at ( the ( same time ) ) ) ) ) ) ) ) ( ( removes ( waste materials ) ) ( from them ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ circulatory) (NN system)) (VP (VBZ transports) (SBAR (S (NP (NP (VBN needed) (NNS materials)) (PP (JJ such) (IN as) (NP (NP (NN food) (, ,) (NN oxygen) (, ,) (CC and) (NN water)) (PP (PP (TO to) (NP (NNS cells))) (CC and) (PP (IN at) (NP (DT the) (JJ same) (NN time))))))) (VP (VBZ removes) (NP (NN waste) (NNS materials)) (PP (IN from) (NP (PRP them))))))) (. .)))
The circulatory system transports needed materials such as food, oxygen, and water to cells and at the same time removes waste materials from them.
(ROOT (S (NP (NP (DT The) (JJ main) (NN function)) (PP (IN of) (NP (DT the) (JJ circulatory) (NN system)))) (VP (VBZ is) (S (VP (TO to) (VP (VB transport) (NP (NNS materials)))))) (. .)))