Complex sentence: In January 1943, the "Combined Bomber Offensive" plan was approved by the Combined Chiefs of Staff, calling for a force of 2,700 heavy bombers and 800 medium bombers based in England to attack German targets on the continent around the clock.
Split into simpler sentences: In January 1943, the Combined Bomber Offensive plan was approved by the Combined Chiefs of Staff. It called for a force of 2,700 heavy bombers and 800 medium bombers based in England to attack German targets on the continent around the clock.