Complex sentence: Meades began writing for the now defunct magazine "Books & Bookmen", which set him on a career as a journalist, working for Richard Branson's magazine "Event", for "The Observer" and as features editor at "Tatler".
Split into simpler sentences: Meades began writing for the now defunct magazine "Books & Bookmen", which set him on a career as a journalist. He went on to work for Richard Branson's magazine "Event", for "The Observer" and as features editor at "Tatler".