( ( ( Sulfur dioxides ) ( -LRB- ( SO2 -RRB- ) ) ) ( ( In ( addition ( to ( the ( natural ( occurring ( sulfur dioxides ) ) ) ) ) ) ) ( , ( ( sulfur dioxide ) ( ( can ( be ( ( formed ( during ( the combustion ) ) ) ( by ( ( combining sulfur ) ( in ( ( the fuel ) ( with oxygen ) ) ) ) ) ) ) ) . ) ) ) ) )
(ROOT (S (NP (NP (JJ Sulfur) (NNS dioxides)) (PRN (-LRB- -LRB-) (NP (NNP SO2)) (-RRB- -RRB-))) (PP (IN In) (NP (NP (NN addition)) (PP (TO to) (NP (DT the) (JJ natural) (JJ occurring) (NN sulfur) (NNS dioxides))))) (, ,) (NP (NN sulfur) (NN dioxide)) (VP (MD can) (VP (VB be) (VP (VBN formed) (PP (IN during) (NP (DT the) (NN combustion))) (PP (IN by) (S (VP (VBG combining) (NP (NN sulfur)) (PP (IN in) (NP (NP (DT the) (NN fuel)) (PP (IN with) (NP (NN oxygen))))))))))) (. .)))
Sulfur dioxides (SO2) In addition to the natural occurring sulfur dioxides, sulfur dioxide can be formed during the combustion by combining sulfur in the fuel with oxygen.
(ROOT (S (NP (NNP Sulfur)) (VP (MD can) (VP (VB combine) (PP (IN with) (NP (NN oxygen))) (S (VP (TO to) (VP (VB produce) (NP (NN sulfur) (NN trioxide))))))) (. .)))