Complex sentence: The name of the building has changed many times: in 1898, it was known as the High School Building, and in 1922 it was known as the Education Building, which it remained until 1968.
Split into simpler sentences: The name of the building has changed many times. In 1898, it was known as the High School Building, and in 1922 it was known as the Education Building, and that named remained until 1968.