Complex sentence: Bee Gilbert, Billy Scherer and others from the Anno's Africa team returned to Kenya every year since then to carry out further arts workshops, which were the subject of a CNN special feature on 11 April 2011.
Split into simpler sentences: Bee Gilbert, Billy Scherer and others from the Anno's Africa team returned to Kenya every year since then to carry out further arts workshops. The continuing arts workshop was the subject of a CNN special feature on 11 April 2011.