the divs and slashes are the html formatting codes, if you view the text in rich text, you won't see them.
However if you have saved a number of records with this formatting and don't want it the way to get rid of them is to use the plaintext function
you'll need to run an update query to update your memo field - something like
UPDATE myTable SET myMemoField=plaintext(myMemoField)
Alternatively modify all your forms and the table to use rich text for the memo field