Complex sentence: Some people still use the name to refer collectively to the 23 special wards, which, while convenient, is inaccurate; the wards do not share a mayor or a city council, but rather function as completely separate municipalities under the metropolitan government.
Split into simpler sentences: Some people still use the name to refer collectively to the 23 special wards. The wards do not share a mayor or a city council, but rather function as separate municipalities under the metropolitan government.