Original sentence: The intricate blackout rules of Major League Baseball coupled with the inaccuracy of ISP-based targeting can leave a fan unable to watch a game on MLB.com can check a viewer's origin by using an e-mail address's domain during registration, by using credit card billing information, or by IP address
Edited sentence: com can check a viewer's origin by using an e-mail address's domain during registration, by using credit card billing information, or by IP address, but the inaccuracy of the ISP-based targeting used leaves many fans unable to watch games on MLB