Simplify the following text for a Grade 10 native English-speaking person.
Original: The 1928 Winter Olympics , officially known as the II Olympic Winter Games , were a winter multi-sport event which was celebrated February 11 â `` 19 , 1928 in St. Moritz , Switzerland .
Simplified: The 1928 Winter Olympics , officially known as the II Olympic Winter Games , were celebrated in 1928 in St. Moritz , Switzerland .