Complex sentence: The feast of St. Jean-Baptiste De La Salle is celebrated on May 15 by the worldwide La Sallian movement of approximately 900,000 students in over 80 countries.
Split into simpler sentences: The feast of St. Jean-Baptiste De La Salle is celebrated on the 15 of May by the worldwide Lasallian movement. The movement consists of approximately 900,000 students in over 80 countries.