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.
One example: The Inheritance Cycle is a series of fantasy books written by Christopher Paolini.
Solution is here: 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".

Now, solve this: Her Majesty 's Most Honourable Privy Council is a group of advisors to the British Monarch .
Solution:
Her Majesty 's Most Honourable Privy Council , usually known simply as the Privy Council of the United Kingdom or just the Privy Council , is a formal body of advisers to the Sovereign of the United Kingdom .