( ( Catabolism ( ( - ( ( Decomposition reactions ) - ) ) bonds ) ) ( ( are broken ) . ) )
(ROOT (S (NP (JJ Catabolism) (PRN (: -) (NP (NNP Decomposition) (NNS reactions)) (: -)) (NNS bonds)) (VP (VBP are) (VP (VBN broken))) (. .)))
Catabolism -Decomposition reactions- bonds are broken.
(ROOT (S (NP (JJ Catabolic) (NNS reactions)) (VP (VBP involve) (S (VP (VBG breaking) (NP (NNS bonds))))) (. .)))