Complex sentence: It broadcasted for three weeks and concluded on 4 December 2009, but will return for a one off episode on 7th December 2009, showing all the celebrities and what they did after they left the jungle.
Split into simpler sentences: It broadcasted for three weeks and concluded on 4 December 2009. There was however an additional episode on 7th December 2009, showing all the celebrities and what they did after they left the jungle.