Complex sentence: A significant improvement in combat capabilities was achieved by boosting the powder charge, made possible by the strong construction of the 155 L. The shells used before 1914 had a speed of 470 m/s and a range not exceeding 9800 meters.
Split into simpler sentences: A significant improvement in combat capabilities was achieved by boosting the powder charge of the 155 L, a measure made possible by the strong construction of the gun. Before 1914, the typical shell fired by the 155 L had a speed of 470 m/s and a range not exceeding 9800 meters.