Original sentence: Since then he has served in Saigon (1974-1975, as 2nd Secretary), Vientiane (1975 on temporary duty), Hanoi (1979 as Chargé d’Affaires), Brussels (1979-1983, as a 1st Secretary with United Kingdom Delegation to NATO), Kuala Lumpur (1983-1986 as Head of Chancery), and Ottawa 1989-1993 as Counsellor, Economic/Commercial
Edited sentence: Since then he has served in Saigon (1974-1975, as 2nd Secretary), Vientiane (1975 on temporary duty), Hanoi (1979 as Chargé d'Affaires), Brussels (1979-1983, as a 1st Secretary with United Kingdom Delegation to NATO), Kuala Lumpur (1983-1986 as Head of Chancery), and Ottawa 1989-1993 as Counsellor, Economic/Commercial