Complex sentence: New Bloomfield Elementary, located in the borough of Bloomfield, was constructed in 1950 as Perry Joint High School, then served as a middle school from the creation of West Perry School District until 2003 when the middle school and Green Park Elementary switched functions.
Split into simpler sentences: New Bloomfield Elementary, located in the borough of Bloomfield, was constructed in 1950 as Perry Joint High School. It later served as a middle school from the creation of West Perry School District until 2003, at which time the middle school and Green Park Elementary switched functions.