Complex sentence: Gavin Robertson, Jilly's handler, revealed that Crufts would be her last show, saying We always decided this would be Jilly's retirement show, so really wanted this to be her best.
Split into simpler sentences: Gavin Robertson, Jilly's handler, revealed that Jilly would be retired after Crufts. He said We always decided this would be Jilly's retirement show, so really wanted this to be her best.