Complex sentence: The main food staples in the diet of the lower classes remained rice, pork, and salted fish; their clothing materials were made of hemp or cotton cloths, restricted to a color standard of black and white.
Split into simpler sentences: The main food staples in the diet of the lower classes remained rice, pork, and salted fish. Clothing was made of hemp or cotton cloths, restricted to a color standard of black and white.