Complex sentence: Sir Mark Howard Potter (born 27 August 1937) is an English judge who was President of the Family Division and Head of Family Justice for England and Wales from 7 April 2005 to 5 April 2010.
Split into simpler sentences: Sir Mark Howard Potter (born 27 August 1937) is an English judge. He has been President of the Family Division and Head of Family Justice for England and Wales since 7 April 2005 and will leave that office on 5 April 2010.