Complex sentence: Then he launched a massive raid on Udayagiri and slaughtered the locals, but Sriranga I kept the fight on and repulsed Sultan's army from Udayagiri after an initial retreat.
Split into simpler sentences: Then he launched a massive raid on Udayagiri and slaughtered the locals. But Sriranga I kept the fight on and repulsed Sultan's army from Udayagiri after an initial retreat.