Complex sentence: In addition to introducing the programs of the YWCA to local communities and churches, Copenhaver participated in seminars and retreats like one held in 1922, which explored the tenets of internationalism that had sprung up after the first World War.
Split into simpler sentences: In addition to introducing the programs of the YWCA to local communities and churches, Copenhaver participated in seminars and retreats. At one gathering in 1922, which explored the tenets of internationalism that had sprung up after the first World War.