( ( A ( pericyclic reaction ) ) ( ( is ( ( a type ) ( of ( reaction ( with ( ( multiple ( carbon-carbon bond ) ) ( ( making and ) breaking ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (JJ pericyclic) (NN reaction)) (VP (VBZ is) (NP (NP (DT a) (NN type)) (PP (IN of) (NP (NP (NN reaction)) (PP (IN with) (NP (NP (JJ multiple) (JJ carbon-carbon) (NN bond)) (VP (VBG making) (CC and) (VBG breaking)))))))) (. .)))
A pericyclic reaction is a type of reaction with multiple carbon-carbon bond making and breaking.
(ROOT (S (NP (JJ Catabolic) (NNS reactions)) (VP (VBP involve) (S (VP (VBG breaking) (NP (NNS bonds))))) (. .)))