Simplify the following text for a Grade 15 native English-speaking person.
Original: Far Eastern Republic ( ; romanised : Dalnevostochnaya Respublika , DVR ) , sometimes called the Chita Republic , was a nominally independent state established at Blagoveshchensk , covering the former Russian Far East and Siberia east of Lake Baikal on April 6 , 1920 .
Simplified: The Far Eastern Republic ( ; romanised : Dalnevostochnaya Respublika , DVR ) , sometimes called the Chita Republic , was a nominally independent state that existed from April 1920 to November 1922 in the easternmost part of the Russian Far East .