( ( ( The burning ) ( of ( fossil fuels ) ) ) ( ( release ( into ( ( ( the ( atmosphere ( sulfur ( and ( nitrogen oxides ) ) ) ) ) , ) ( which ( are ( converted ( to ( ( ( sulfuric and ) nitric ) acids ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN burning)) (PP (IN of) (NP (JJ fossil) (NNS fuels)))) (VP (VBP release) (PP (IN into) (NP (NP (DT the) (NN atmosphere) (NN sulfur) (CC and) (NN nitrogen) (NNS oxides)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBP are) (VP (VBN converted) (PP (TO to) (NP (ADJP (JJ sulfuric) (CC and) (JJ nitric)) (NNS acids)))))))))) (. .)))
The burning of fossil fuels release into the atmosphere sulfur and nitrogen oxides, which are converted to sulfuric and nitric acids.
(ROOT (S (NP (DT The) (NN element) (NN sulfur)) (VP (VBZ is) (VP (VBN released) (PP (IN into) (NP (DT the) (NN atmosphere))) (PP (IN by) (NP (NP (DT the) (NN burning)) (PP (IN of) (NP (JJ fossil) (NNS fuels))))))) (. .)))