Complex sentence: This type, combined with other blood, developed into the Charolais, which belonged to a group of French breeds called "demi-sang" or "half-bloods"--crosses between native breeds and Thoroughbreds.
Split into simpler sentences: This type, combined with other blood, developed into the Charolais. The Charolais belonged to a group of French breeds called "demi-sang" or "half-bloods", which were crosses between native breeds and Thoroughbreds.