Original sentence: The Mayor of Derry , also known as theMayor of Londonderry  is an honorary position bestowed upon a Citizen of Derry in Northern Ireland, who is in practice a member of Derry City Council, chosen by his or her peers on the Council
Edited sentence: The Mayor of Derry , is an honorary position bestowed upon a Citizen of Derry in Northern Ireland, who is in practice a member of Derry City Council, chosen by his or her peers on the Council