Complex sentence: In judo and some forms of karate where a sixth dan will wear a red and white belt, although the red and white belt is often reserved only for ceremonial occasions, while a black belt is still worn during training.
Split into simpler sentences: In judo and some forms of karate, a sixth dan will wear a red and white belt. The red and white belt is often reserved only for ceremonial occasions, and a regular black belt is still worn during training.