Complex sentence: Killings re-signed with World Wrestling Entertainment, formerly the World Wrestling Federation (WWF), in 2008 and debuted on the SmackDown brand under the ring name R-Truth on August 29, as a face, defeating Kenny Dykstra.
Split into simpler sentences: Killings re-signed with World Wrestling Entertainment, formerly the World Wrestling Federation (WWF), in 2008. He made his in-ring return on the August 29,2008 episode of "SmackDown" as a face, defeating Kenny Dykstra.