Part 1. 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.
Part 2. Example
The Inheritance Cycle is a series of fantasy books written by Christopher Paolini.
Answer: The Inheritance Cycle is a tetralogy of young adult high fantasy novels written by American author Christopher Paolini.
Explanation: The output sentence elaborates on the input sentence without changing its general meaning e.g. "tetralogy of young adult high fantasy novels".
Part 3. Exercise
But if the water where it lives freezes in the winter , it must migrate to the south or to the coast to find something to eat .
Answer:
If its territory has access to open water , it remains there year-round , but if the body of water freezes during the winter , making it impossible to obtain food , it migrates to the south or to the coast .