Definition: In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
Input: Zakarpattia Oblast was formally established on January 22 , 1946 after the annexation of Subcarpathian Rus lands to the Ukrainian Soviet Socialist Republic .
Output:
Zakarpattia Oblast was established on 22 January 1946 , after the resignation of Czechoslovakia on the territory of " Subcarpathian Ruthenia " , annexed forcibly by the Soviet Union and attached to the Ukrainian Soviet Socialist Republic , under a treaty between Czechoslovakia and the Soviet Union .