Complex sentence: He performed at the 2011 Glasgow Show on Glasgow Green in front of 20,000 people, headlining the Sunday show along with a Retake That and other guests in August 2011, he secured a record deal with Syco and Sony Music to be released in December 2011.
Split into simpler sentences: He performed at the 2011 Glasgow Show on Glasgow Green in front of 20,000 people, headlining the Sunday show along with a Retake That and other guests. In August 2011, he secured a record deal with Syco and Sony Music to be released in December 2011.