Complex sentence: Still more refined than the Furioso-North Star was the Kisbér-Felver, developed around 1900, a breed of saddle and light carriage horses that were more often chestnut or bay.
Split into simpler sentences: Still more refined than the Furioso-North Star was the Kisbér-Felver, developed around the turn of the century. These elegant saddle and light carriage horses were more often chestnut or bay.