Complex sentence: From 1990 until 1995 he served as the editor of "The Spectator" magazine, a post his father had served in from 1966 to 1970, then "The Sunday Telegraph" until 2005, when he was replaced by Sarah Sands.
Split into simpler sentences: From 1990 until 1995 he served as the editor of "The Spectator" magazine, a post his father had served in from 1966 to 1970. He was then editor of "The Sunday Telegraph" until 2005, when he was replaced by Sarah Sands.