Complex sentence: The Paine brothers used Colt revolvers in the 25 metre military pistol event, these pistols were superior to the arms used by their opponents, and the brothers had little difficulty winning the top two spots.
Split into simpler sentences: The Paine brothers used Colt revolvers in the military pistol event. These pistols were superior to the arms used by their opponents, and the brothers had little difficulty winning the top two spots.