Multiple themes

Hi all! I have two blogs which I would like to consolidate into one.

The first is https://www.saharsblog.com–its lovely and doesn’t require any changes (thankfully haha).

The second one is https://www.saharsreviews.com.
I would like to be able to see what is currently at https://www.saharsreviews.com at the URL https://www.saharsblog.com/reviews.

Any tips for a basic WordPress level user? Thank you!