Complex sentence: Yellow soybean paste is a fermented paste made from yellow soybeans, salt, and water; wheat flour, though not formerly used, is often used as an additional ingredient in the modern day, and potassium sorbate may also be used as a preservative.
Split into simpler sentences: Yellow soybean paste is a fermented paste made from yellow soybeans, salt, and water. Wheat flour, though not formerly used, is often used as an additional ingredient in the modern day, and potassium sorbate may be used as a preservative.