Complex sentence: Prior to the 2016 Summer Olympics, these policies were changed by the IOC; athletes are no longer restricted in participating in marketing campaigns for non-sponsors, as long as they do not use the Olympics' intellectual property or imply an official association with the Games.
Split into simpler sentences: Prior to the 2016 Summer Olympics, these policies were changed by the IOC. Athletes are no longer restricted in participating in marketing campaigns for non-sponsors, as long as they do not use the Olympics' intellectual property or imply an official association with the Games.