Show & Modify 2 list details from 2 different bases

I have base 1 > table 1, and base 2 > table 2. table 2 is synced in base 1 and is linked with table 1.
Now, I would like to show list details from table 1 and its linked table 2 and let the user modify all the details (from table 1 AND 2) → which is why I can’t show the fields from the synced table.
Anyone has an idea?
For now, I can show details from table 1, but I can’t use data from table 1 to filter list details from table 2 (as they’re from 2 different bases).