Complex sentence: Strategic bombing is defined as the reduction by air attack of the enemy's capability to manufacture war materiel and its will to continue the war by destroying factories, oil refineries, railroads, and other infrastructure rather than just directly targeting supply depots or enemy combatants.
Split into simpler sentences: Strategic bombing is defined as the reduction by air attack of the enemy's capability to manufacture war materiel and its will to continue the war. This is intended to exhaust the enemy by destroying factories, oil refineries, railroads, and other infrastructure rather than just directly targeting supply depots or enemy combatants.