Complex sentence: The building was originally called the CM Tower, for Calcasieu Marine National Bank, then renamed the Hibernia tower after Hibernia merged with Cacasieu Marine, then was changed to the Capital One Tower after Capital One acquired Hibernia National Bank in 2005.
Split into simpler sentences: The building was originally called the CM Tower, for Calcasieu Marine National Bank, then renamed the Hibernia tower after Hibernia merged with Cacasieu Marine. It was then changed to Capital One Tower after Capital One Bank acquired Hibernia National Bank in 2005.