Complex sentence: SS-100-X was the U.S. Secret Service code name for the Presidential limousine in which John F. Kennedy was assassinated, based on a 1961 Lincoln and designed and built by Hess & Eisenhardt of Cincinnati, Ohio.
Split into simpler sentences: SS-100-X was the U.S. Secret Service code name for the Presidential limousine in which John F. Kennedy was assassinated. It was based on a 1961 Lincoln automobile, designed and built by Hess & Eisenhardt of Cincinnati, Ohio.