Original sentence: David Shayler (born 24 December 1965) is a British journalist and former MI5 (Security Service) officer.He stood in the 2005 general election in the constituency of Sedgefield against the then Prime Minister Tony Blair, but decided to withdraw and switched his support to Reg Keys
Edited sentence: David Shayler (born 24 December 1965) is a British journalist, former MI5 (Security Service) officer and self-proclaimed Messiah