Complex sentence: The 1988 United States Figure Skating Championships was an event organized by U.S. Figure Skating to determine the U.S. national champions and the U.S. teams for the 1988 Winter Olympics and 1988 World Championships.
Split into simpler sentences: The 1988 United States Figure Skating Championships was an event organized by U.S. Figure Skating to determine the U.S. national champions. The event was one of the criteria used to determine the U.S. teams for the 1988 Winter Olympics, as well as the 1988 World Championships.