Converting PDFs into Jpegs so they can be used in Photoshop

Techno dinosaur using older version of Elements.  Trying to put together lots of photos for a family reunion.  All of mine are working well because they are already Jpeg files.  Many relatives have sent photos in PDF formats and I cannot figure out how to convert them to be able to use them in the slide show.  I am hoping this is a very simple question?