Complex sentence: Heath Slater and Rhyno are a professional wrestling tag team who perform for the American-based professional wrestling promotion, WWE on the "SmackDown" brand, where they are the current and inaugural SmackDown Tag Team Champions after winning a tournament culminating at Backlash.
Split into simpler sentences: Heath Slater and Rhyno are a professional wrestling tag team who perform for the American-based professional wrestling promotion, WWE on the SmackDown brand. They are the current and inaugural SmackDown Tag Team Champions after winning a tournament culminating at Backlash.