Complex sentence: "Rehab" was the twelfth song on Rihanna's set list for her 2010 Last Girl on Earth Tour, throughout which she performed it on a therapist's couch adorned with metal casts of human heads and limbs.
Split into simpler sentences: Rehab was the twelfth song on Rihanna's set list for her 2010 Last Girl on Earth Tour. Throughout the tour, Rihanna performed "Rehab" on a therapist's couch adorned with metal casts of human heads and limbs.