( But ( ( standard ( bond-breaking ( chemical reactions ) ) ) ( ( tend ( to ( be indiscriminate ) ) ) . ) ) )
(ROOT (S (CC But) (NP (JJ standard) (JJ bond-breaking) (NN chemical) (NNS reactions)) (VP (VBP tend) (S (VP (TO to) (VP (VB be) (ADJP (JJ indiscriminate)))))) (. .)))
But standard bond-breaking chemical reactions tend to be indiscriminate.
(ROOT (S (NP (JJ Catabolic) (NNS reactions)) (VP (VBP involve) (S (VP (VBG breaking) (NP (NNS bonds))))) (. .)))