Complex sentence: On 6 March 2017 full permission was given to redevelop Stamford Bridge by the mayor of London, Sadiq Kahn, who said the "high quality and spectacular design" would add to the capital's "fantastic array of sporting arenas".
Split into simpler sentences: On 6 March 2017 full permission was given to redevelop Stamford Bridge by the mayor of London, Sadiq Kahn. Sadiq Khan said the "high quality and spectacular design" would add to the capital's "fantastic array of sporting arenas".