Complex sentence: Legislators representing the city of Atlanta and southwestern Fulton County, which feared for the tax revenue that would be lost, used the legislative requirement that all local legislation be approved first by a delegation of representatives from the affected area to block the bills.
Split into simpler sentences: Legislators representing the city of Atlanta and southwestern Fulton County feared the loss of tax revenue. They used the legislative requirement that all local legislation be approved first by a delegation of representatives from the affected area to block the bills.