Complex sentence: Grilling is generally done quickly over moderate-to-high direct heat with little smoke, while barbecuing is done slowly over low indirect heat, therefore, the food is flavored by the smoking process, as well as by the sauces used.
Split into simpler sentences: Grilling is generally done quickly over moderate-to-high direct heat with little smoke, while barbecuing is done slowly over low indirect heat. Therefore, the food is flavored by the smoking process, as well as by the sauces used.