Simplify the following text for a Grade 10 native English-speaking person.
Original: The 1968 Winter Olympics , officially known as the X Olympic Winter Games , were a winter multi-sport event which was celebrated in 1968 in Grenoble , France and opened on February 6 .
Simplified: The 1968 Winter Olympics , officially known as the X Olympic Winter Games , were celebrated in 1968 Grenoble , France and opened on February 6 .