Complex sentence: Bred to be mute to ground, they are disqualified from trials if they sound at the quarry; their deep and authoritative bark is similar to that of a larger dog, making them an excellent burglar deterrent.
Split into simpler sentences: Bred to be mute to ground, they are disqualified from trials if they sound at the quarry. Their deep and authoritative bark is similar to that of a larger dog, making them an excellent burglar deterrent.