Complex sentence: The Borden Institute closed in 1906 and around 1910 became used as William W. Borden High School, or simply Borden High School, and served this purpose until 1955 when a new Elementary and Jr-Sr High School were built adjacent to the Institute.
Split into simpler sentences: The Borden Institute closed in 1906 and around 1910 became used as William W. Borden High School, or simply Borden High School. The Institue served this purpose until 1955 when a new Elementary and Jr-Sr High School were built adjacent to the Institute.