Merge known duplicate
Welcome to CiviCRM SE.

You can merge the contacts manually via search results. Here is a link to the specifics:

https://docs.civicrm.org/user/en/latest/common-workflows/deduping-and-merging/#merging-contacts-from-search-results

You should also review the information on merging two contacts manually here:

https://docs.civicrm.org/user/en/latest/common-workflows/deduping-and-merging/#using-rules-and-merging-duplicate-contacts-manually

Hope this helps!