Complex sentence: In selecting her name the Board of Admiralty continued a tradition, dating to 1644, of using familiar geographic names; overall ten of the nineteen "Coventry"-class were named after landmarks or towns.
Split into simpler sentences: In selecting her name the Board of Admiralty continued a tradition, dating to 1644, of using geographic names. Overall, ten of the nineteen "Coventry"-class vessels, including "Levant", were named after well-known regions, rivers or towns.