( ( As ( ( the ( organic matter ) ) burns ) ) ( , ( ( the carbon ) ( ( is ( changed ( to ( ( ( ( ( carbon dioxide ) ( -LRB- ( ( CO 2 ) -RRB- ) ) ) and ) ( carbon monoxide ) ) ( -LRB- ( CO -RRB- ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN As) (S (NP (DT the) (JJ organic) (NN matter)) (VP (VBZ burns)))) (, ,) (NP (DT the) (NN carbon)) (VP (VBZ is) (VP (VBN changed) (PP (TO to) (NP (NP (NN carbon) (NN dioxide)) (PRN (-LRB- -LRB-) (NP (QP (CD CO) (CD 2))) (-RRB- -RRB-)) (CC and) (NP (NN carbon) (NN monoxide)) (PRN (-LRB- -LRB-) (NP (NNP CO)) (-RRB- -RRB-)))))) (. .)))
As the organic matter burns, the carbon is changed to carbon dioxide (CO 2 ) and carbon monoxide (CO).
(ROOT (S (NP (NNP Co) (CD 2)) (VP (VBZ is) (NP (NP (DT the) (JJ molecular) (NN formula)) (PP (IN of) (NP (NN carbon) (NN dioxide))))) (. .)))