Complex sentence: Joan Helen Vickers, Baroness Vickers, DBE (1907-23 May 1994) was elected Conservative Member of Parliament for Devonport in 1955, defeating Michael Foot, and sat until February 1974 when she was defeated by Dr David Owen.
Split into simpler sentences: Joan Helen Vickers, Baroness Vickers, DBE (1907-23 May 1994) was a Conservative politician. She sat until February 1974 when she was defeated by Dr David Owen.