Original: Held from 17 June to 19 June 1944, this celebration was referred to as "The Jubilee Celebrations of IOC" by Carl Diem, the originator of the modern tradition of the Olympic torch relay.
Simplified: These events happened on 17 June to 19 June 1944 and were called "The Jubilee Celebrations of IOC" by Carl Diem, the man who began the modern tradition of the Olympic torch relay.