( ( ( The burning ) ( ( ( of ( ( fossil fuels ) ( of ( poor quality ) ) ) ) and ) ( with ( ( a ( high concentration ) ) ( of sulfur ) ) ) ) ) ( ( leads ( to ( ( an atmosphere ) ( that ( is ( enriched ( in ( ( ( sulfur oxides ) , ) ( which ( ( form acids ) ( with ( rain water ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN burning)) (PP (PP (IN of) (NP (NP (JJ fossil) (NNS fuels)) (PP (IN of) (NP (JJ poor) (NN quality))))) (CC and) (PP (IN with) (NP (NP (DT a) (JJ high) (NN concentration)) (PP (IN of) (NP (NN sulfur))))))) (VP (VBZ leads) (PP (TO to) (NP (NP (DT an) (NN atmosphere)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (VP (VBN enriched) (PP (IN in) (NP (NP (NN sulfur) (NNS oxides)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBP form) (NP (NNS acids)) (PP (IN with) (NP (NN rain) (NN water))))))))))))))) (. .)))
The burning of fossil fuels of poor quality and with a high concentration of sulfur leads to an atmosphere that is enriched in sulfur oxides, which form acids with rain water.
(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))))))) (. .)))