( ( ( ( ( There ( is ( ( a transformation ) ( of energy ) ) ) ) , ) but ) ( it ( is ( ( ( taking place ) entirely ) ( within ( ( ( your ( own muscles ) ) , ) ( which ( are ( ( converting ( chemical energy ) ) ( into heat ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (EX There)) (VP (VBZ is) (NP (NP (DT a) (NN transformation)) (PP (IN of) (NP (NN energy)))))) (, ,) (CC but) (S (NP (PRP it)) (VP (VBZ is) (VP (VBG taking) (NP (NN place)) (ADVP (RB entirely)) (PP (IN within) (NP (NP (PRP$ your) (JJ own) (NNS muscles)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBP are) (VP (VBG converting) (NP (NN chemical) (NN energy)) (PP (IN into) (NP (NN heat)))))))))))) (. .)))
There is a transformation of energy, but it is taking place entirely within your own muscles, which are converting chemical energy into heat.
(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)))))) (. .)))