Complex sentence: To minimize heating during rapid fire, the gun used a very heavy straight contour barrel (finned for ventilation on later variants), bringing its weight up to 35 pounds; the standard tripod mount with seat for the gunner added another 56 pounds.
Split into simpler sentences: To minimize heating during rapid fire, the gun used a very heavy straight contour barrel (finned for ventilation on later variants), bringing its weight up to 35 pounds. The standard tripod mount with seat for the gunner added another 56 pounds.