Simplify the following text for a Grade 10 native English-speaking person.
Original: The 1972 Winter Olympics , officially known as the XI Olympic Winter Games , were a winter multi-sport event which was celebrated from February 3 to February 13 , 1972 in Sapporo , HokkaidÅ , Japan .
Simplified: The 1972 Winter Olympics , officially known as the XI Olympic Winter Games , were celebrated in 1972 in Sapporo , Japan .