Complex sentence: The Mughal ruler Shah Jahan then sent his son Aurangzeb with an army of 50,000 soldiers to recapture Kandahar, but although he defeated Abbas II outside the city he was unable to take it.
Split into simpler sentences: The Mughal ruler Shah Jahan then sent his son Aurangzeb with an army of 50,000 soldiers to recapture Kandahar. Although Aurangzeb defeated Abbas II outside the city, he was unable to take it.