Complex sentence: US restaurants usually restrict the item to the breakfast menu due mainly because the grill temperature for the beef patties and the eggs are significantly different according to Herb Peterson in a special episode of "Unwrapped".
Split into simpler sentences: US restaurants usually restrict the item to the breakfast menu. This is due mainly because the grill temperature for the beef patties and the eggs are significantly different from each other, according to Herb Peterson in a special episode of "Unwrapped".