Complex sentence: In the Organic Rankine Cycle (ORC), working fluids with higher boiling points have higher net outputs of energy at the low temperatures of the Rankine Cycle, making zeotropic working fluids better candidates than pure substances.
Split into simpler sentences: In the Organic Rankine Cycle (ORC), zeotropic mixtures are more thermally efficient than pure fluids. Due to their higher boiling points, zeotropic working fluids have higher net outputs of energy at the low temperatures of the Rankine Cycle than pure substances.