( But ( you ( ( can ( ( form them ) ( at ( ( combustion ( temperatures characteristic ) ) ( of ( ( wood burning ) ( in ( wood-burning stoves ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (CC But) (NP (PRP you)) (VP (MD can) (VP (VB form) (NP (PRP them)) (PP (IN at) (NP (NP (NN combustion) (NNS temperatures) (NN characteristic)) (PP (IN of) (NP (NP (NN wood) (NN burning)) (PP (IN in) (NP (JJ wood-burning) (NNS stoves))))))))) (. .)))
But you can form them at combustion temperatures characteristic of wood burning in wood-burning stoves.
(ROOT (S (NP (NNP Wood) (NNP burning)) (VP (VBZ is) (NP (NP (DT an) (NN example)) (PP (IN of) (NP (NP (DT a) (JJ different) (NN substance)) (VP (VBG being) (VP (VBN formed))))))) (. .)))