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: The oath of office of the President of the United States is an oath that the president as he takes office .
Solution:
The oath of office of the president of the United States is the oath or affirmation that the president of the United States takes after assuming the presidency but before exercising or carrying out any presidential powers or duties .