Original sentence: A further major redevelopment programme for the Southwark site, costing £16.7 million, was started in 1986 and opened by the Queen on 29 June 1989.A second stage of redevelopment was completed in 1994 and a third stage in 2000.The latter expansion, the Southwest Infill, was partly funded by a £12.6 million grant from the Heritage Lottery Fund and provided 5,860m2 of gallery space and educational facilities over six floors The development included the installation of the museum's Holocaust Exhibition which was opened by the Queen in June 2000.This gallery featured tanks, artillery pieces, vehicles, ordnance and aircraft from the First World War to the Falklands War, and for some years the museum was marketed as 'The new Imperial War Museum'.This work included the development of what was previously the hospital's courtyard as a Large Exhibits Gallery
Edited sentence: A second stage of redevelopment, providing a further 1,600m2 of floor space was completed in 1994 and a third stage in 2000.By 1983 the museum was again looking to redevelop the Southwark site and approached engineering firm Arup to plan a phased programme of works that would expand the building's exhibition space, provide appropriate environmental controls to protect collections, and improve facilities for visitors.Into this space were placed tanks, artillery pieces, vehicles, ordnance and aircraft from the First World War to the Falklands War, and for some years the museum was marketed as 'The new Imperial War Museum'.The first phase of these works, started in 1986, created 8,000m2 of gallery space of which 4,6002 was new, and saw the conversion of what was previously the hospital's courtyard into a centrepiece Large Exhibits Gallery.The latter expansion, the Southwest Infill, was partly funded by a £12.6 million grant from the Heritage Lottery Fund and provided 5,860m2 of gallery space and educational facilities over six floors The development included the installation of the museum's Holocaust Exhibition which was opened by the Queen on 6 June 2000.This first phase cost £16.7 million (of which £12 million was provided by the government) and was opened by the Queen on 29 June 1989.This gallery featured a strengthened ground floor (to support the weight of very heavy exhibits), a first floor mezzanine and second storey viewing balcony