Original: Since its launch in 1998, the site has provided information on all four physical Tate galleries (Tate Britain, Tate St Ives, Tate Liverpool and Tate Modern) under the same domain.
Simplified: Since its launch in 1998, the site has had information on all four Tate galleries (Tate Britain, Tate St Ives, Tate Liverpool and Tate Modern) in the same website.