Complex sentence: After the hurricane of 1900, the city originated the City Commission form of city government (which became known as the "Galveston Plan"), although the city has since adopted the council-manager form of government.
Split into simpler sentences: After the hurricane of 1900, the city originated the City Commission form of city government (which became known as the "Galveston Plan"). The city has since adopted the council-manager form of government.