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: Camera lenses with a shorter focal length are called " wide-angle lenses " , those with a longer one " telephoto lenses " .
Solution:
Lenses of shorter focal length are called " wide-angle lenses " , while longer-focal-length lenses are referred to as long-focus lenses ( with the most common of that type being the " telephoto lenses " ) .