Complex sentence: Carbohydrates account for a major portion of the human diet and compromised of three principal monosaccharides: glucose, fructose and galactose; in addition glycogen is the storage form of carbohydrates in humans.
Split into simpler sentences: Carbohydrates account for a major portion of the human diet. These carbohydrats are composed of three principal monosaccharides: glucose, fructose and galactose; in addition glycogen is the storage form of carbohydrates in humans.