( ( ( The ( Novacor 's ) ) ( primary function ) ) ( ( is ( to ( ( assist ( ( ( ( the ( left ventricle ) ) , ) ( ( the ( heart 's ) ) ( main ( pumping chamber ) ) ) ) , ) ) ( until ( ( a ( human ( donor heart ) ) ) ( becomes available ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NNP Novacor) (POS 's)) (JJ primary) (NN function)) (VP (VBZ is) (S (VP (TO to) (VP (VB assist) (NP (NP (DT the) (JJ left) (NN ventricle)) (, ,) (NP (NP (DT the) (NN heart) (POS 's)) (JJ main) (JJ pumping) (NN chamber)) (, ,)) (SBAR (IN until) (S (NP (DT a) (JJ human) (NN donor) (NN heart)) (VP (VBZ becomes) (ADJP (JJ available))))))))) (. .)))
The Novacor's primary function is to assist the left ventricle, the heart's main pumping chamber, until a human donor heart becomes available.
(ROOT (S (PP (IN In) (NP (NNS humans))) (, ,) (NP (DT the) (NN heart)) (VP (VBZ is) (NP (DT the) (JJ first) (NN organ) (S (VP (TO to) (VP (VP (VB form)) (CC and) (VP (VB become) (ADJP (JJ functional)))))))) (. .)))