Q: In this task, we ask you to rewrite a sentence in simple English without changing its general meaning. Essentially, you want to make the sentence easier to read by using simpler words, utilizing more straightforward sentence structures, and omitting non-essential information etc.
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 .
A:
Zakarpattia Oblast was formally established on January 22 , 1946 after the annexation of Subcarpathian Rus lands to the Ukrainian Soviet Socialist Republic .