Complex sentence: François Chouteau died at age 41, probably of a heart attack, in Kansas City, Missouri on 18 April 1838 and he was buried from the Old Cathedral of St. Louis in St. Louis one week later, on 25 April.
Split into simpler sentences: François Chouteau died at age 41, probably of a heart attack, in Kansas City, Missouri on 18 April 1838. His funeral was held at the Old Cathedral of St. Louis in St. Louis one week later, on 25 April.