( ( ( The ( chemical makeup ) ) ( of ( wood substance ) ) ) ( ( is ( far ( from clear ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ chemical) (NN makeup)) (PP (IN of) (NP (NN wood) (NN substance)))) (VP (VBZ is) (ADVP (RB far) (PP (IN from) (ADJP (JJ clear))))) (. .)))
The chemical makeup of wood substance is far from clear.
(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))) (. .)))