Complex sentence: Up until the fifteenth century kimonos were made of a natural fiber called hemp or out of linen, and they were made with multiple layers, then over the following 200 years silk fabrics, new colors, and single layers were introduced to the kimono.
Split into simpler sentences: Up until the fifteenth century kimonos were made of hemp or linen, and they were made with multiple layers. Over the following 200 years silk fabrics, new colors, and single layers were introduced to the kimono.