( ( ( The ( high temperature ) ) ( of ( lightening discharge ) ) ) ( ( causes ( some ( of ( ( the ( ( nitrogen and ) oxygen ) ) ( in ( the ( air ( to ( ( ( combine and ) form ) ( oxides ( of nitrogen ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ high) (NN temperature)) (PP (IN of) (S (VP (VBG lightening) (NP (NN discharge)))))) (VP (VBZ causes) (NP (NP (DT some)) (PP (IN of) (NP (NP (DT the) (NN nitrogen) (CC and) (NN oxygen)) (PP (IN in) (NP (DT the) (NN air) (S (VP (TO to) (VP (VB combine) (CC and) (VB form) (NP (NP (NNS oxides)) (PP (IN of) (NP (NN nitrogen))))))))))))) (. .)))
The high temperature of lightening discharge causes some of the nitrogen and oxygen in the air to combine and form oxides of nitrogen.
(ROOT (S (NP (NNP Nitrogen)) (VP (VBZ oxide) (NP (NP (NN form)) (PRN (-LRB- -LRB-) (PRP s) (-RRB- -RRB-)) (SBAR (WHADVP (WRB when)) (S (NP (NN nitrogen) (CC and) (NN oxygen)) (VP (VBP combine) (PP (IN at) (NP (JJ high) (NNS temperatures)))))))) (. .)))