Query – group by 2 like fields in a table

My table looks like this:
Sales(a)||Date(a)||Sales(b)||Date(b)||Sales(c)||Da te(c)
1) 50 05/06 75 06/15 100 08/15
So I want to show all sales with the criteria - Date >05/01 <07/01.
The final query totals will be
Sales||Date
50 05/06
75 06/15
So the issue is that there are 38 rows with similar data in each column
I have the table in this format because I also have a form that feeds off this table and it needs to be in this format-but I would also like to run a query/report from this table that summaries sales. I also know that since there is more than 1 date value in the row, this is going to make the query difficult to run (each date is linked to a certain sales total).
I guess what I want to do is transfer the horizontal data to vertical data (with certain criteria)
Please help!!!