Original: During the reign of Sennacherib of Assyria, Babylonia was in a constant state of revolt, led by Mushezib-Marduk, and suppressed only by the complete destruction of the city of Babylon.
Simplified: During the reign of Sennacherib of Assyria, Babylonia was in a constant state of revolt, and was suppressed only by the complete destruction of the city of Babylon.