Complex sentence: Llanhari is one of the older Welsh Medium secondary schools in the area, having opened in 1974 it followed Ysgol Gyfun Rhydfelen as vanguard of such schools in South Wales.
Split into simpler sentences: Llanhari is one of the older Welsh medium secondary schools in the area, having opened in 1974. It followed Ysgol Gyfun Rhydfelen as vanguard of such schools in South Wales.