Complex sentence: The Winter and Summer Olympic Games were held in the same years until 1992, after a 1986 decision by the International Olympic Committee (IOC) to place the Summer and Winter Games on separate four-year cycles in alternating even-numbered years.
Split into simpler sentences: The Winter and Summer Olympic Games were held in the same years until 1992. In 1986 a decision was made by the International Olympic Committee (IOC) to place the Summer and Winter Games on separate four-year cycles in alternating even-numbered years.