Complex sentence: Plainville High School was previously located on East Street from (dates 1920s-1950s), which later became Plainville Junior High School up until the mid- 1990s when they built the Middle School of Plainville on Northwest Drive.
Split into simpler sentences: Plainville High School was previously located on East Street from the 1920s through the 1950s. It later became Plainville Junior High School up until the mid- 1990s when they built the Middle School of Plainville on Northwest Drive.