Complex sentence: Wide traverse was also useful on some shipmounted guns; an early and significant example was the two-gun turret containing smoothbore muzzle loaders mounted on the foredeck of USS "Monitor" launched in 1862.
Split into simpler sentences: Wide traverse was also useful on some shipmounted guns. An early and significant example was the two-gun turret, containing smoothbore muzzle loaders mounted on the foredeck of USS "Monitor" launched in 1862.