Complex sentence: The Philippidès stadium is equipped to hold international events and has already hosted several international events such as: the, the university championships of France, and it has served as a training base for many athletes preparing for national, and European competitions.
Split into simpler sentences: The Philippidès stadium is equipped to hold international events and has already hosted several international events such as: the and the university championships of France. It has also served as a training base for many athletes preparing for national and European competitions.