Complex sentence: Born in Wallasey, he was educated at a secondary modern school on the Wirral; at the age of 15, he was taken on by the Ocean Steam Ship Company, working as a steward for four years.
Split into simpler sentences: Born in Wallasey, he was educated at a secondary modern school on the Wirral. At the age of 15, he was taken on by the Ocean Steam Ship Company, working as a steward for four years.