Complex sentence: The Siege of Bijapur was among the longest military engagements by the Mughals, lasting more than 15 months until the Mughal Emperor Aurangzeb personally arrived to organize a victory.
Split into simpler sentences: The Siege of Bijapur was among the longest military engagements by the Mughals. It lasted more than 15 months until the Mughal Emperor Aurangzeb personally arrived to organize a victory.