( ( For example ) ( , ( ( sulfur trioxide ) ( ( ( is not ) ( ( produced quantitatively ) ( by ( ( the combustion ) ( of sulfur ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN For) (NP (NN example))) (, ,) (NP (NN sulfur) (NN trioxide)) (VP (VBZ is) (RB not) (VP (VBN produced) (ADVP (RB quantitatively)) (PP (IN by) (NP (NP (DT the) (NN combustion)) (PP (IN of) (NP (NN sulfur))))))) (. .)))
For example, sulfur trioxide is not produced quantitatively by the combustion of sulfur.
(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))))))) (. .)))