Complex sentence: It was called the "most in-demand theatre production of all time", after the entire run sold out in seven hours when tickets went on sale to the public on August 11,2014, more than a year before the play opened.
Split into simpler sentences: It was called the "most in-demand theatre production of all time". The entire run sold out in seven hours after tickets went on sale 11 August 2014, more than a year before the play opened.