Complex sentence: Her cover of Elton John's "Your Song" reached number two in the UK in December 2010 and on 29 April 2011 she performed the song at the wedding reception of Prince William and Catherine Middleton at Buckingham Palace.
Split into simpler sentences: Her cover of Elton John's "Your Song" reached number two in the UK in December 2010, and on 29 April 2011. She performed the song at the wedding reception of Prince William and Catherine Middleton at Buckingham Palace.