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Do the join as usual, on the first column. The middle output will have three rows, all for JE001. Then do a Cross Tab to concatenate the multiple rows into a single row. (See attachment for this done on your sample data).
You can also achieve this by just using the summarize tool to streamline things. Just do a group by for the JE number and a concatenate for the description. You can change the default seperator to a comma with space (from a comma) for visual clarity.