Complex sentence: Bischoff allowed the illegal use of a steel chair to give Rated-RKO the win, marking DX's first defeat as a tag team since their reunion in June 2006.
Split into simpler sentences: Bischoff allowed the illegal use of a steel chair to give Rated-RKO the win. With this win, Rated-RKO became the first team to "defeat" DX in a tag team match since their reunion in June 2006.