( ( ( ( ( ( Decomposing wastes ) ( produce ( ( a ( flammable gas ) ) ( called methane ) ) ) ) , ) and ) ( ( methane explosions ) ( can result ) ) ) . )
(ROOT (S (S (NP (VBG Decomposing) (NNS wastes)) (VP (VBP produce) (SBAR (S (NP (DT a) (JJ flammable) (NN gas)) (VP (VBD called) (NP (NN methane))))))) (, ,) (CC and) (S (NP (NN methane) (NNS explosions)) (VP (MD can) (VP (VB result)))) (. .)))
Decomposing wastes produce a flammable gas called methane, and methane explosions can result.
(ROOT (S (NP (NNS Archaeans)) (VP (VBP produce) (NP (NN methane) (NN gas)) (PP (IN as) (NP (DT a) (NN waste) (NN product)))) (. .)))