Create your select query for the two combined tables, locate it and copy & paste it into notepad or somewhere.
Then create queries for each table seperately - that will allow the wizard to create the insert, update, and delete statements for the tables.
Manipulate the code with the select statement that you saved from the combined tables and you will be on the right track. You will have to do some tweeking to the code for loading and updating the datasets but the SQL statements will be generated for you by the wizard and should work just fine.
Also, this is generally considered a Master/Detail relationship and the dataform wizard will create a 2 datagrid form for you with insert, update, and delete capabilities. Give it a try also.