( Oxidizer ( -- ( ( Is ( ( a substance ) ( that ( ( ( ( gives up ) oxygen ) easily ) ( to ( stimulate ( combustion ( of ( organic material ) ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (NP (NNP Oxidizer)) (: --) (VP (VBZ Is) (NP (NP (DT a) (NN substance)) (SBAR (WHNP (WDT that)) (S (VP (VBZ gives) (PRT (RP up)) (NP (NN oxygen)) (ADVP (RB easily)) (S (VP (TO to) (VP (VB stimulate) (NP (NP (NN combustion)) (PP (IN of) (NP (JJ organic) (NN material)))))))))))) (. .)))
Oxidizer-- Is a substance that gives up oxygen easily to stimulate combustion of organic material.
(ROOT (S (NP (NNP Combustion) (NN reaction)) (VP (VBZ occurs) (SBAR (WHADVP (WRB when)) (S (NP (DT a) (NN substance)) (VP (VBZ reacts) (ADVP (RB quickly)) (PP (IN with) (NP (NN oxygen))))))) (. .)))