Complex sentence: On 14 November 2012 the programme broadcast a one-hour-long special edition, prompted by the controversy that the BBC was undergoing at that time, partly highlighted by the resignation of George Entwistle from his job as Director-General of the BBC.
Split into simpler sentences: On 14 November 2012 the programme broadcast a one-hour-long session. This was due to the controversy that the BBC was undergoing at the time, partly highlighted by the resignation of George Entwistle from his job as Director-General of the BBC.