Complex sentence: It was created on 20 February 1926 for the politician, diplomat and writer Edgar Vincent, 1st Baron D'Abernon who had been created Baron D'Abernon, of Esher in the County of Surrey, on 2 July 1914.
Split into simpler sentences: It was created on 20 February 1926 for the politician, diplomat and writer Edgar Vincent, 1st Baron D'Abernon. He had already been created Baron D'Abernon, of Esher in the County of Surrey, on 2 July 1914.