Complex sentence: In July, he added to his score almost daily, a third balloon busting on the 1st, followed by one of the most triumphant months in the history of fighter aviation, adding 17 victims during the month.
Split into simpler sentences: In July, he added to his score almost daily. He kicked off his month with a third balloon busting on the 1st, and proceeded to run off one of the most triumphant months in the history of fighter aviation, adding 17 victims during the month.