Complex sentence: The gain in efficiency is possible due to the enhanced reversibility of the two redox reactions; in traditional single stage combustion, the release of a fuel's energy occurs in a highly irreversible manner-departing considerably from equilibrium.
Split into simpler sentences: The gain in efficiency is possible due to the enhanced reversibility of the two redox reactions. In traditional single stage combustion, the release of a fuel's energy occurs in a highly irreversible manner-departing considerably from equilibrium.