Complex sentence: Till the middle of Akbar's reign, the highest rank an ordinary officer could hold was that of a commander of 5000; the more exalted grades between commanders of 7000 and 10,000 were reserved for the royal princes.
Split into simpler sentences: Till the middle of Akbar's reign, the highest rank an ordinary officer could hold was that of a commander of 5,000. The more exalted grades between commanders of 7,000 and 10,000 were reserved for the royal princes.