Complex sentence: He was a supporter of Remain in the June 2016 European Union referendum; however, he has made it clear that he respects the referendum result and will work for the best Brexit deal for Stoke.
Split into simpler sentences: He was a supporter of Remain in the June 2016 European Union referendum. He has made it clear that he respects the referendum result and will work for the best'Brexit' deal for Stoke.