( Fires ( ( are ( ( chemical reactions ) ( that ( ( ( burn energy ) and ) ( ( give off ) ( ( heat and ) light ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Fires)) (VP (VBP are) (NP (NP (NN chemical) (NNS reactions)) (SBAR (WHNP (WDT that)) (S (VP (VP (VBP burn) (NP (NN energy))) (CC and) (VP (VBP give) (PRT (RP off)) (NP (NN heat) (CC and) (NN light)))))))) (. .)))
Fires are chemical reactions that burn energy and give off heat and light.
(ROOT (S (S (NP (DT The) (NN energy)) (VP (VBZ transformations) (SBAR (IN that) (S (VP (VBP occur) (SBAR (WHADVP (WRB when)) (S (NP (DT a) (NN candle) (NNS burns)) (VP (VBZ is) (VP (VBN described) (PP (IN by))))))))))) (: :) (S (NP (NP (NN chemical) (NN energy)) (PP (IN from) (NP (DT the) (NN wax)))) (VP (VBZ is) (VP (VBN converted) (PP (IN into) (NP (NN light) (CC and) (NN heat) (NN energy)))))) (. .)))