Complex sentence: The chief executive officer of Williamson County's government is the County Mayor, who is popularly elected for a four-year term, and is responsible for the County's fiscal management and its day-to-day business.
Split into simpler sentences: The chief executive officer of Williamson County's government is the County Mayor. The Mayor is popularly elected for a four-year term, and is responsible for the County's fiscal management and its day-to-day business.