Complex sentence: John Frederick Ovenden (born 17 August 1942) was British Labour Party Member of Parliament for the marginal seat of Gravesend from 1974 to 1979, when he lost to the Conservative Timothy Brinton.
Split into simpler sentences: John Frederick Ovenden (born 17 August 1942) was a British Labour Party politician. Ovenden served as Member of Parliament for the marginal seat of Gravesend from 1974 to 1979, when he lost to the Conservative Timothy Brinton.