( ( The ( left atrium ) ) ( ( receives ( ( oxygenated blood ) ( ( returning ( to ( the heart ) ) ) ( from ( ( the lungs ) ( via ( way ( of ( the ( four ( pulmonary veins ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ left) (NN atrium)) (VP (VBZ receives) (NP (NP (JJ oxygenated) (NN blood)) (VP (VBG returning) (PP (TO to) (NP (DT the) (NN heart))) (PP (IN from) (NP (NP (DT the) (NNS lungs)) (PP (IN via) (NP (NP (NN way)) (PP (IN of) (NP (DT the) (CD four) (JJ pulmonary) (NNS veins)))))))))) (. .)))
The left atrium receives oxygenated blood returning to the heart from the lungs via way of the four pulmonary veins.
(ROOT (S (NP (NP (DT The) (JJ right) (NN atrium)) (PP (IN of) (NP (DT the) (NN heart)))) (VP (VBZ receives) (SBAR (S (NP (DT the) (NN blood)) (VP (VBZ is) (VP (VBN pumped) (PP (IN from) (NP (NP (NNS veins)) (PP (IN of) (NP (DT the) (JJ systemic) (NN circuit)))))))))) (. .)))