Teacher: 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.
Teacher: Now, understand the problem? If you are still confused, see the following example:
The Inheritance Cycle is a series of fantasy books written by Christopher Paolini.
Solution: The Inheritance Cycle is a tetralogy of young adult high fantasy novels written by American author Christopher Paolini.
Reason: The output sentence elaborates on the input sentence without changing its general meaning e.g. "tetralogy of young adult high fantasy novels".

Now, solve this instance: Zakarpattia Oblast was formally established on January 22 , 1946 after the annexation of Subcarpathian Rus lands to the Ukrainian Soviet Socialist Republic .
Student:
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 .