Simplify the following text for a Grade 10 native English-speaking person.
Original: James Gordon Brown ( born 20 February 1951 ) is a British Labor Party politician , who has been a Member of Parliament ( MP ) since 1983 , currently for Kirkcaldy and Cowdenbeath .
Simplified: James Gordon Brown ( born 20 February 1951 ) was the Prime Minister of the United Kingdom and was the leader of the British Labor Party . He is the Labor MP Representative for the Kirkcaldy and Cowdenbeath UK Constituency .