Complex sentence: Glendora High School was built in 1958 on the land owned by Mr. Clarks Gordon.The Land on which GHS was constructed contained multitudes of Oak Trees which still grace the school ground to this day.
Split into simpler sentences: Glendora High School was built in 1958 on the land owned by Mr. Clarks Gordon. The land on which GHS was constructed contained multitudes of oak trees which still grace the school ground to this day.