Complex sentence: Lacey Brown, Didi Benami, Katie Stevens, Siobhan Magnus and Crystal Bowersox performed a medley of Aguilera's hits "Beautiful" and "Fighter", where Aguilera also performed her 2010 single "You Lost Me".
Split into simpler sentences: Lacey Brown, Didi Benami, Katie Stevens, Siobhan Magnus and Crystal Bowersox performed a medley of Aguilera's hits "Beautiful" and "Fighter". In that episode, Aguilera herself performed her 2010 single "You Lost Me".