Find query "Vehicles Extended". Open in design view (you may have to drag the design grid portion up from the bottom to make it visible). Expand the left most field. You will see this expression
Vehicle Name: [Year] & " " & [Make] & " " & [Model]
You would need to change this 'calculated' (concatenated) field in the query itself. Another possibly more sensible approach would be to hide the existing control (in case you need it back later) and add one for the license number as there isn't one on the form. You would have to modify the query behind the form (Past Expenses) to include the license field.
As for the spaces in names, what else do you expect from a Microsoft template except things that violate good design principles?
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.