Here are examples of the word/phrase "shorten" used in a sentence and paraphrased in a sentence...
I can use this software to shorten my sentences.
I can use this software to abbreviate my sentences.
This essay is too long. Can you please shorten it.
This essay is too long. Can you please minimize it.
If your speech is too long, you are going to have to shorten it.
If your speech is too long, you are going to have to truncate it.
Other Examples...