Complex sentence: They became members of the independent Golden Baseball League on September 1,2008, and will once again play their home games at legendary Hi Corbett Field in Tucson beginning (tentatively) May 27,2009, at the start of the league's fifth anniversary.
Split into simpler sentences: They became members of the independent Golden Baseball League on September 1,2008. They will once again play their home games at Hi Corbett Field in Tucson beginning (tentatively) May 27,2009, at the start of the league's fifth anniversary.