Complex sentence: The IOC has adapted to economic, political, and technological advancements, shifting the Olympics from pure amateurism, as envisioned by Coubertin, to allow participation of professional athletes.
Split into simpler sentences: The IOC has had to adapt to a variety of economic, political, and technological advancements. As a result, the Olympics shifted away from pure amateurism, as envisioned by Coubertin, to allow participation of professional athletes.