MS Access has limited capabilities to manage raw SQL queries: the editor is quite bad, no syntax highlighting, it reformats your raw SQL into a long string and you can\'t in
I wrote Access SQL Editor-- an Add-In for Microsoft Access-- because I write quite a lot of pass-through queries, and more complex SQL within Access. This add-in has the advantage of being able to store formatted SQL (with comments!) within your Access application itself. When queries are copied to a new Access application, formatting is retained. When the built-in editor clobbers your formatting, the tool will show your original query and notify you of the difference.
It currently does not debug; if there was enough interest, I would pursue this-- but for the time being the feature set is intentionally kept small.
It is not free for the time being, but purchasing a license is very cheap. If you can't afford it, you can contact me. There is a free 14-day trial here.
Once it's installed, you can access it through your Add-Ins menu (In Access 2010 it's Database Tools->Add Ins).