I was suggesting you to open the "Data" panel, select your columns, right-click, select "custom split" and enter your field separator, but I am now afraid this feature just came with version 9, right?
I don't see any option for that in the Version I have. So must be a new feature.
Have you tried doing the data split (i.e. text to columns) in Excel and then link the Excel sheet to Tableau instead?
Unfortunately the custom split is only from v9 (I see you're using 8.2) Split a Field into Multiple Fields
The file is to big for excel to open, and a 3rd of the data is actually being picked up correctly. Just the data seems to slip every so often making large parts of the data useless. I thought the CSV file may have been the issue but there is no change in the formatting and is being read correctly in other software.
Just an issue when it goes into Tableau. Thought someone may have come across this before.