( ( M85 vehicles ) ( ( tend ( to ( emit ( ( ( 30 ( % ( to ( 50 % ) ) ) ) less ) ( ozone-forming compounds ) ) ) ) ) . ) )
(ROOT (S (NP (NNP M85) (NNS vehicles)) (VP (VBP tend) (S (VP (TO to) (VP (VB emit) (NP (ADJP (NP (CD 30) (NN %) (TO to) (CD 50) (NN %)) (JJR less)) (JJ ozone-forming) (NNS compounds)))))) (. .)))
M85 vehicles tend to emit 30% to 50% less ozone-forming compounds.
(ROOT (S (NP (NN Ozone)) (VP (VBZ is) (NP (NP (DT a) (NN compound)) (VP (VBN formed) (SBAR (WHADVP (WRB when)) (S (NP (EX there)) (VP (VBZ is) (VP (VBG sparking) (NP (JJ electrical) (NN equipment))))))))) (. .)))