Complex sentence: The song received its debut live performance at the 2012 Summer Olympics closing ceremony on August 12,2012 and subsequently entered the UK Singles Chart Top 40 at number 15.
Split into simpler sentences: The song received its debut live performance at the 2012 Summer Olympics closing ceremony on August 12,2012 and subsequently entered the UK Singles Chart Top 40 at No15. On August 19,2012 the song entered the UK Singles Chart at number 15.