Complex sentence: President John F. Kennedy attended a dedication ceremony in 1963; after he was assassinated later that year, the section of Interstate 90 between downtown Chicago and O'Hare was renamed the Kennedy Expressway.
Split into simpler sentences: President John F. Kennedy attended a dedication ceremony in 1963. After Kennedy was assassinated later that year, the section of Interstate 90 between downtown Chicago and O'Hare was renamed the Kennedy Expressway.