Complex sentence: Rather than using the furnaces to produce hot air with a heat exchanger, these kilns use the smoke from the furnaces to circulate among the grains, drying them, giving a light color and an intense, smokey flavor.
Split into simpler sentences: Rather than using the furnaces to produce hot air with a heat exchanger, these kilns use the smoke from the furnaces to circulate among the grains. This smoke dries the grain, and contributes a light color and an intense, smokey flavor.