Original sentence: It is available nationally on Cablevision, DirecTV, Dish Network and AT&T U-verse, Comcast, Time Warner Cable, Charter Communications, Verizon FiOs, Cox Communications and several other cable television systems
Edited sentence: It is available nationally on  DirecTV and Dish Network;  and regionally CablevisionAT&T U-verse, Comcast, Time Warner Cable, Charter Communications, Verizon FiOs, Cox Communications and several other cable television systems