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.

Let me give you an example: The Inheritance Cycle is a series of fantasy books written by Christopher Paolini.
The answer to this example can be: The Inheritance Cycle is a tetralogy of young adult high fantasy novels written by American author Christopher Paolini.
Here is why: The output sentence elaborates on the input sentence without changing its general meaning e.g. "tetralogy of young adult high fantasy novels".

OK. solve this:
The Advertising Council , mostly called the Ad Council , is an American non-profit organization that creates public service announcements on behalf of sponsors , including non-profit organizations and the United States government .
Answer:
The Advertising Council , commonly known as the Ad Council , is an American nonprofit organization that produces , distributes , and promotes public service announcements on behalf of various sponsors , including nonprofit organizations , non-governmental organizations and agencies of the United States government .