Complex sentence: The 2014 London Sevens was the eighth edition of the rugby union tournament and the final stage of the 2013--14 IRB Sevens World Series and was hosted at Twickenham Stadium in London, England.
Split into simpler sentences: The 2014 London Sevens was the eighth and final tournament of the 2013--14 IRB Sevens World Series. This edition of the London Sevens was hosted at Twickenham Stadium in London, England.