Original: Margaret Hilda Thatcher, Baroness Thatcher LG, OM, PC, FRS (born 13 October 1925) served as Prime Minister of the United Kingdom from 1979 to 1990 and Leader of the Conservative Party from 1975 to 1990.
Simplified: Margaret Hilda Thatcher, Baroness Thatcher LG, OM, PC, FRS  (born Margaret Hilda Roberts October 13, 1925) was the first woman Prime Minister of the United Kingdom from 1979 to 1990.