Question: Hylton Riverside is a large retail park that hosts a business founded when 50 JJB Sports Fitness Clubs and the attached retail stores were purchased by who?

Context paragraphs:
Fleetsbridge: Fleetsbridge is a small area of Poole, Dorset, centred on a busy gyratory and flyover.  It lies north of Poole town centre and borders the neighbouring suburbs of Waterloo, Creekmoor, Oakdale and Canford Heath.  The use of land varies between residential, retail and some light industry.  The area is also home to Parkstone Grammar School when it moved there from Lower Parkstone in 1962.  The site of the Tesco at Fleets Corner was, up until the 1980s, the home of Hamworthy Recreation Football Club before the land was sold and the club moved to Canford Magna on the northern extreme of the Borough of Poole.  Opposite to Tesco, across Waterloo Road, is the home of the headquarters of the global company, Hamworthy Combustion Engineering.  Fleets Industrial Estate lies to the south of the gyratory off Fleets Lane and is adjacent to Wessex Gate Retail Park, which has large retail outlets such as DFS, Currys and PC World.

DW Sports Fitness: DW Sports Fitness is a British retailing and fitness business.  Founded in March 2009 when Dave Whelan purchased the 50 JJB Sports Fitness Clubs and the attached retail stores for £83.4 million.  At the time all the sites were shared between a fitness club and retail store, with most cases seeing the fitness club downstairs and the retail store upstairs.  Since that time the group has grown to encompass more than 60 sites, including stand-alone retail stores and stand-alone fitness clubs.

Crescent Link Retail Park: Crescent Link Retail Park is an out-of-town retail park located in the south eastern periphery of Derry, Northern Ireland.  It is just off the A514, which itself is named Crescent Link; hence the retail park's name.  The development is located 3 mi from the centre of Derry City.

Castletown, Sunderland: Castletown is a small village of Sunderland in Tyne and Wear commonly visited by tourists from around the world.  A former mining community, the Hylton Colliery was located at the east end of the village, it lies north of the River Wear, and is near to Hylton Castle and Washington.  At Hylton Riverside, on the eastern fringe of Castletown, there is a large retail park hosting stores such as Matalan, Costa Coffee, Aldi and Pets at Home, Premier Inn and a DW Sports Fitness gym.  There are currently on going talks and plans to transform this retail park into a more modern and high-end park hosting a range of designer stores such as Farfetch, Apple and Waitrose to project the vision of this luxurious community.  There is also plans to build a large 13-screen Odeon Cinema.  Along with the range of retail establishments there is also a wide range of restaurants in the village such as McDonald's, KFC and Solo Pizza (formerly known as Mario's Pizza).

JJB Sports: JJB Sports plc (stylized as JJb sports) was a British sports retailer.  On 24 September 2012, shares in JJB Sports were suspended, and the firm called in administrators.  On 1 October 2012, it was announced that Sports Direct had purchased part of the business, including twenty stores, the brand, and its website for £28.3 million.

Birstall Shopping Park: Birstall Shopping Park is a shopping park located in Birstall, Batley, West Yorkshire, England.  It contains a wide variety of retailers and includes the region's only IKEA store.  Adjacent is another retail park, Junction 27 Retail Park, specialising in bulky goods and electronics.  The section of the park containing retailers Pets at Home and Homesense is known as Spring Ram Retail Park, and was built slightly later than the rest of the complex, however it is considered as a part of Birstall Shopping Park and is under common ownership.

WestEnd Shopping Park: WestEnd Shopping Park is a retail park, located in Blanchardstown in Dublin.  It is beside the Blanchardstown Centre.  It is owned by Green REIT and is the sister to Gullivers Retail Park.  Tenants include Lidl, Next, Dealz, Heatons, Nike, Gap, Argos, Costa and more.  In 2015, the first Toys "R" Us store in Ireland, opened in the retail park but closed in 2016.

Letterkenny Retail Parks: Letterkenny Retail Park and Riverside Retail Park are retail parks on the Paddy Harte/Link Road in central Letterkenny, County Donegal.  The largest retail parks in the county, they have come out as the best nationwide in terms of rent versus footfall.

Airside Retail Park: Airside Retail Park is a retail park which opened in 2001, and is located in Swords in County Dublin.  The retail park is located close to Dublin Airport.  An extension was built in 2005, doubling the size of the retail park.  There is a Premier Inn hotel located next to the retail park.

Hindpool Retail Parks: The Hindpool Retail Parks are a set of four conjoined retail parks in the Hindpool area of Barrow-in-Furness, England, United Kingdom (with the exception of one which straddles the border with Central Barrow).  Some thirty stores and leisure facilities contain a total of 43,000 m2 of retail space (around one quarter of the borough's 199000 m2 of retail floorspace).  The four retail parks are Cornerhouse Retail Park, Cornmill Crossing, Hindpool Retail Park and Hollywood Park.  The largest and only other retail park in Barrow is Walney Road Retail Park - Pound Stretcher, Argos Extra, Asda, Home Bargains, Matalan and Stollers.

Supporting paragraphs: Castletown, Sunderland DW Sports Fitness
Answer: Dave Whelan