Complex sentence: As of 2017, one Major League Baseball franchise have never hosted an All-Star Game: the Tampa Bay Rays and the Miami Marlins, who are now hosting in 2017 following the 2012 opening of Marlins Park.
Split into simpler sentences: As of 2017, one Major League Baseball franchise have never hosted an All-Star Game: the Tampa Bay Rays. The Miami Marlins, who are now hosting in 2017 following the 2012 opening of Marlins Park.