( Now ( ( ( the ( carbon atom ) ) ( we ( are following ) ) ) ( ( is ( ( ( ( sent out ) ( inlo ( the air ) ) ) ( as ( ( a part ) ( of ( a ( carbon ( dioxide molecule ) ) ) ) ) ) ) again ) ) . ) ) )
(ROOT (S (ADVP (RB Now)) (NP (NP (DT the) (NN carbon) (NN atom)) (SBAR (S (NP (PRP we)) (VP (VBP are) (VP (VBG following)))))) (VP (VBZ is) (VP (VBN sent) (PRT (RP out)) (NP (JJ inlo) (DT the) (NN air)) (PP (IN as) (NP (NP (DT a) (NN part)) (PP (IN of) (NP (DT a) (NN carbon) (NN dioxide) (NN molecule))))) (ADVP (RB again)))) (. .)))
Now the carbon atom we are following is sent out inlo the air as a part of a carbon dioxide molecule again.
(ROOT (S (NP (NNP Air)) (VP (VBZ is) (VP (VBN made) (PP (IN of) (NP (NNS atoms))))) (. .)))