Complex sentence: The 2011 Kumho V8 Touring Car Series was an Australian motor racing series for V8 Touring Cars, which are de-registered and superseded former V8 Supercars.
Split into simpler sentences: The 2011 Kumho V8 Touring Car Series is an Australian motor racing series. The series is a touring car series held for V8 Touring Cars, which are de-registered and superseded former V8 Supercars.