Complex sentence: For Hurricane Ike in 2008, Selig mandated that the Astros play two home games against the Chicago Cubs in his hometown of Milwaukee despite proximity to the visiting Cubs; the home ballparks for the Texas Rangers and Atlanta Braves were both available to host the games.
Split into simpler sentences: For Hurricane Ike in 2008, Selig mandated that the Astros play two home games against the Chicago Cubs in his hometown of Milwaukee despite proximity to the visiting Cubs. The home ballparks for the Texas Rangers and Atlanta Braves were both available to host the games.