Complex sentence: Vefa boza, as it is known, is made only from hulled millet, which is boiled in water and then poured into broad shallow pans; when cool the mixture is sieved, and water and sugar added.
Split into simpler sentences: Vefa boza, as it is known, is made only from hulled millet, which is boiled in water and then poured into broad shallow pans. When cool the mixture is sieved, and water and sugar added.