Complex sentence: The Office of Special Affairs (OSA) is a department of the Church of Scientology responsible for directing legal affairs, public relations, pursuing investigations, publicizing the Church's "social betterment works", and "oversee (ing its) social reform programs".
Split into simpler sentences: The Office of Special Affairs (OSA) is a department of the Church of Scientology. According to the Church, the OSA is responsible for directing legal affairs, public relations, pursuing investigations, publicizing the Church's "social betterment works", and "oversee (ing its) social reform programs".