Simplify the following text for a Grade 17 native English-speaking person.
Original: In 2000 , the Tate Gallery transformed itself into the current-day Tate , which consists of a federation of four museums : Tate Britain which displays the collection of British art from 1500 to the present day ; Tate Modern which is also in London , houses the Tate 's collection of British and International Modern and Contemporary Art from 1900 to the present day .
Simplified: In 2000 , the Tate Gallery split its collection into four museums : Tate Britain ( in the original building ) displays the collection of British art from 1500 to the present day ; Tate Modern which is also in London , houses the Tate 's collection of British and International Modern and Contemporary Art from 1900 to the present day .