Complex sentence: It was officially announced on 25 December 2008, that the WIN Corporation had bought the naming rights for Jubilee Oval, now owning the rights for both of St. George Illawarra's home grounds, Jubilee Oval and WIN Stadium.
Split into simpler sentences: It was officially announced on 25 December 2008, that WIN Corporation had bought the naming rights for Jubilee Oval,. With this agreement, WIN owned the naming rights to both of St. George Illawarra's home grounds, WIN Jubilee Oval and WIN Stadium.