Complex sentence: The Japanese School of New York was located in Yonkers for one year; on August 18,1991 the school moved to Yonkers from Queens, New York City and on September 1,1992 classes began at its current location in Greenwich, Connecticut.
Split into simpler sentences: The Japanese School of New York was located in Yonkers for one year. On September 1,1992 classes began at its current location in Greenwich, Connecticut.