Often times while you write, things may get wordy and unnecessarily lengthy. Apple’s Summarize service can help proofread your work and quickly condense text from a large number of paragraphs, potentially down to a few sentences. You will have the ability to change the Summary Size percentage and condense by the Sentence or Paragraph. To enable the Summarize service:
Go to System Preferences and choose Keyboard
Select Shortcuts, then select Services from the left-hand menu
Under the Text section make sure Summarize is selected
Optionally, you can create a keyboard shortcut to access Summarize or right-click and select Summarize in the Services menu to use the tool.