Complex sentence: Adolphus Busch, a wholesaler who had immigrated to St. Louis from Germany in 1857, married Eberhard Anheuser's daughter in 1861; following his service in the American Civil War, Busch began working as a salesman for the Anheuser brewery.
Split into simpler sentences: Adolphus Busch, a wholesaler who had immigrated to St. Louis from Germany in 1857, married Eberhard Anheuser's daughter in 1861. Following his service in the American Civil War, Busch began working as a salesman for the Anheuser brewery.