Complex sentence: It is similar to the Combat Commander, a downsized version of the Government Model M1911, but is even smaller, with a shortened grip and a 6-round magazine.
Split into simpler sentences: It is similar to the Combat Commander, a downsized version of the Government Model M1911, but is even smaller. Rather than a standard 7-round magazine like the Government Model, or the Commander, it uses a 6-round magazine.