Complex sentence: The "Luftwaffe" retained air superiority into early November and Soviet daytime aerial resistance was nonexistent, but after flying 20,000 individual sorties, its original strength of 1,600 serviceable aircraft had fallen to 950.
Split into simpler sentences: The "Luftwaffe" retained air superiority into November and Soviet daytime aerial resistance was nonexistent. After flying 20,000 individual sorties, the "Luftwaffe" original strength of 1,600 serviceable aircraft had fallen to 950.