Original sentence: He returned to advisory work for the government and in December 1984 he stood for and won the Enfield Southgate by-election following the murder of the incumbent, Sir Anthony Berry, in the bombing by the IRA of the Grand Hotel in Brighton, England
Edited sentence: He returned to advisory work for the government and in December 1984 he stood for and won the Enfield Southgate by-election following the murder of the incumbent, Sir Anthony Berry, in the terrorist attack by the IRA on the Grand Hotel in Brighton, England