Complex sentence: Believed to be a pericyclic reaction, the enzyme's transition state, when transferring a hydrogen from C2 to C9, is cyclic and its bond breaking and subsequent formation are conjoint processes.
Split into simpler sentences: Believed to be a pericyclic reaction, the enzyme's transition state, when transferring a hydrogen from C2 to C9, is cyclic. Its bond breaking and subsequent formation are conjoint processes.