Complex sentence: Denison is a member city of the regional public transportation system called TAPS, which offers on-demand service, fixed routes to Choctaw and Sherman, and services to Dallas/Fort Worth and Dallas Love Field airports.
Split into simpler sentences: Denison is also a member city of the regional public transportation system called TAPS. TAPS has on demand service, fixed routes to Choctaw and Sherman, and services to DFW and Dallas Love Field Airports.