Complex sentence: Although it is an excellent breed with no major faults, it has never become a popular or well-known breed, but is slowly gaining notoriety with many upland bird and waterfowl hunters in the U.S. and Canada.
Split into simpler sentences: Although it is an excellent breed with no major faults, it has never become a popular or well-known breed. However, it is slowly gaining notoriety with many upland bird and waterfowl hunters in the U.S. and Canada.