Complex sentence: The greatest earthquake in state history, it registered an estimated magnitude of 5.1 on the Richter scale and resulted in extensive minor damage, reaching its maximum severity near its epicenter in the city of Irondale.
Split into simpler sentences: The greatest earthquake in state history, it registered an estimated magnitude of 5.1 on the Richter scale. Resulting in extensive minor damage, it reached its maximum severity near the epicenter in the city of Irondale.