Complex sentence: On July 1,2006 International Samaritan opened its new headquarters in Ann Arbor, Michigan, it was previously headquartered at St. John's Jesuit High School and Academy where its founder served as president until 2007.
Split into simpler sentences: On July 1,2006, International Samaritan opened its new headquarters in Ann Arbor, Michigan. It was previously headquartered at St. John's Jesuit High School and Academy where its founder served as president until 2007.