Complex sentence: Hunt left the BBC briefly in 2007 to take up the role of Controller of Programmes for Five, but on 3 December 2007 it was announced that she would be returning to the BBC to take up the vacant post of Controller of BBC One in 2008.
Split into simpler sentences: Hunt left the BBC briefly in 2007 to take up the role of Controller of Programmes for Five. On 3 December 2007 it was announced that she would be returning to the BBC to take up the vacant post of Controller of BBC One in 2008.