Complex sentence: The weak-mayor, although elected by voters, has little real political power and less independence under this form than a strong-mayor, serves largely ceremonial duties, and even may be a member of the council.
Split into simpler sentences: The weak-mayor is elected by voters, but has little real political power and less independence under this form than a strong-mayor. A weak mayor serves largely ceremonial duties, and even, may be a member of the council.