Complex sentence: The current lead, Peter Capaldi, took on the role after Matt Smith's exit in the 2013 Christmas special "The Time of the Doctor", and confirmed he would be leaving at the end of the tenth series.
Split into simpler sentences: The current lead, Peter Capaldi, took on the role after Matt Smith's exit in the 2013 Christmas special "The Time of the Doctor". He has confirmed he would be leaving at the end of the tenth series.