Complex sentence: It premiered at the Pleasance Theatre in London in December 2013 before touring the UK in 2014 and 2015 where it received exceptional critical acclaim across the country, and in December 2015 it opened at London's Apollo Theatre.
Split into simpler sentences: It premiered at the Pleasance Theatre in London in December 2013 before touring the UK in 2014 and 2015 where it received exceptional critical acclaim across the country. In December 2015 it opened at London's Apollo Theatre.