Complex sentence: Nizams of Ahmednagar and the Adilshahis of Bijapur; the Mughal Emperor Aurangzeb then assembled the most advanced Mughal army to date and began his siege on Golconda Fort.
Split into simpler sentences: Nizams of Ahmednagar and the Adilshahis of Bijapur. The Mughal Emperor Aurangzeb had assembled the most advanced Mughal army to date during his siege of Golconda Fort.