Description not showing up

Here is the feed I’m trying to put on my site:
http://www.gmmf1.net/rss/gmmrss223.xml

The links on the site go directly to the image mentioned in the <link> field.

I’d like to show the description as well but it doesn’t show up.

If I go the the “Custom Feed” here: https://thegrandprixclub.com/wprss
I see the description in the output.

Do I need a plugin to show the description?

Thank you.

The page I need help with: [log in to see the link]