Complex sentence: Marshal of Italy Pietro Badoglio, the Chief-of-Staff in Rome, made promises instead, "When you have the seventy medium tanks you will dominate the situation", as Balbo prepared to invade Egypt on 15 July.
Split into simpler sentences: Marshal of Italy Pietro Badoglio, the Chief-of-Staff in Rome made promises instead. According to Badoglio, "When you have the seventy medium tanks you will dominate the situation", Balbo was preparing to invade Egypt starting on 15 July.