Complex sentence: The third "Rock in Rio" festival took place in 2001 and its seven nights were headlined, respectively, by Sting, R.E.M., Guns N'Roses,' N Sync, Iron Maiden, Neil Young and the Red Hot Chili Peppers.
Split into simpler sentences: The third "Rock in Rio" festival took place in 2001. Its seven nights were headlined, respectively, by Sting, R.E.M., Guns N'Roses,' N Sync, Iron Maiden, Neil Young and the Red Hot Chili Peppers.