( ( In ( ( ( carbon dioxide ) , ) ( which ( consists ( of ( ( ( one ( carbon atom ) ) and ) ( two ( heavier ( oxygen atoms ) ) ) ) ) ) ) ) ) ( , ( ( the carbon ) ( ( accounts ( for ( ( ( roughly 27 ) percent ) ( of ( the ( total weight ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (NP (NN carbon) (NN dioxide)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ consists) (PP (IN of) (NP (NP (CD one) (NN carbon) (NN atom)) (CC and) (NP (CD two) (JJR heavier) (NN oxygen) (NNS atoms))))))))) (, ,) (NP (DT the) (NN carbon)) (VP (VBZ accounts) (PP (IN for) (NP (NP (QP (RB roughly) (CD 27)) (NN percent)) (PP (IN of) (NP (DT the) (JJ total) (NN weight)))))) (. .)))
In carbon dioxide, which consists of one carbon atom and two heavier oxygen atoms, the carbon accounts for roughly 27 percent of the total weight.
(ROOT (S (NP (NNP Carbon) (NN dioxide) (NNS molecules)) (VP (VBP consist) (PP (IN of) (NP (NP (DT a) (JJ central) (NN carbon) (NN atom)) (VP (VBN bonded) (PP (TO to) (NP (CD two) (NN oxygen) (NNS atoms))))))) (. .)))