Complex sentence: In 1979, the company created Thorpe Park in Staines, Surrey by redeveloping one of its disused quarries as a leisure park when quarrying was complete: the park was sold in 1998 to The Tussauds Group, owner of Alton Towers and nearby Chessington World Of Adventures.
Split into simpler sentences: In 1979, the company created Thorpe Park in Staines, Surrey by redeveloping one of its disused quarries as a leisure park when quarrying was complete. The company operated Thorpe Park u til 1998, when they sold the park to The Tussauds Group, owner of Alton Towers and nearby Chessington World Of Adventures.