Complex sentence: The city is named after The Rt Hon. Cecil Calvert, 2nd Baron Baltimore, (1605--1675), a British peer who had a hereditary seat in the Irish House of Lords and and was the founding proprietor of the Province of Maryland.
Split into simpler sentences: The city is named after The Rt Hon. Cecil Calvert, 2nd Baron Baltimore (1605--1675). Lord Baltimore was a British peer who had a hereditary seat in the Irish House of Lords and and was the founding proprietor of the Province of Maryland.