( ( Energy This ) ( ( is ( ( a ( good introduction ) ) ( to ( energy ( , ( heat ( , ( and ( chemical energy ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Energy) (NNP This)) (VP (VBZ is) (NP (NP (DT a) (JJ good) (NN introduction)) (PP (TO to) (NP (NN energy) (, ,) (NN heat) (, ,) (CC and) (NN chemical) (NN energy))))) (. .)))
Energy This is  a good introduction to energy, heat, and chemical energy.
(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)))))) (. .)))