Complex sentence: On 24 June 2011, Sheeran performed the song at Glastonbury Festival 2011 on the BBC Introducing Stage as well as live at the iTunes Festival on 8 July 2011 and at the 2011 Reading and Leeds Festivals.
Split into simpler sentences: On 24 June 2011, Sheeran performed the song at Glastonbury Festival 2011 on the BBC Introducing Stage. He has also performed it live at the iTunes Festival on 8 July 2011 and at the 2011 Reading and Leeds Festivals.