Good question. The staff listings use WordPress’s excerpt function. If content is entered into the excerpt box when you’re editing a staff member it will be displayed on the listing page, otherwise the first 55 words of the main content will be displayed.
So to have a small portion displayed that’s different from the beginning of the post, you can enter it into the excerpt box.
If you’d like to add in a read more link you can. Here’s how to do that:
Go to the Appearance section in your WordPress dashboard and choose Edit.
From the list of files on your right, choose staff-entry.php
Replace all the content there with this:
(Visit the support site to see the code).
Save your changes.
That should add in a read more link after the excerpt. If you have any trouble, let me know.