Complex sentence: He then became an assistant producer for "On the Record", and in 1993 was promoted to deputy editor on "Panorama", the world's longest-running current affairs programme, for three years.
Split into simpler sentences: He then became an assistant producer for "On the Record", and was later promoted to deputy editor. In 1993 he moved to "Panorama", the world's longest-running current affairs programme, in the role of deputy editor for three years.