Complex sentence: He was deselected by the DUP in South Antrim in 2007, but returned to the Assembly in 2010 when he was selected to replace William McCrea following his resignation.
Split into simpler sentences: He was deselected by the DUP in South Antrim in 2007,. He returned, however, to the Assembly in 2010 when he was selected to replace William McCrea following his resignation.