Complex sentence: Construction of Hautlieu's first building began on the 18th April, 1951 and was officially opened on the 5th April, 1952, and was originally a boys' grammar school until the admission of its first female student in 1960.
Split into simpler sentences: Construction of Hautlieu's first building began on the 18th April, 1951 and was officially opened on the 5th April, 1952. It was originally a boys' grammar school until the admission of its first female student in 1960.