( ( ( ( The bat ) and ) ( ( the ( original piece ) ) ( of wood ) ) ) ( ( ( are still ) ( the ( same ( chemical substance ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN bat)) (CC and) (NP (NP (DT the) (JJ original) (NN piece)) (PP (IN of) (NP (NN wood))))) (VP (VBP are) (ADVP (RB still)) (NP (DT the) (JJ same) (NN chemical) (NN substance))) (. .)))
The bat and the original piece of wood are still the same chemical substance.
(ROOT (S (NP (NP (DT The) (NN action)) (PP (IN of) (S (VP (VBG burning) (NP (NP (DT a) (NN piece)) (PP (IN of) (NP (NN wood)))))))) (VP (VBZ forms) (NP (DT a) (JJ different) (NN chemical) (NN substance))) (. .)))