As OriginalGriff pointed out, never store several values in a single column. Doing so will introduce a whole bunch of unnecessary complexity in your program, for example the question you're currently asking.
If you would have three columns, you could easily define the sorting as
ORDER BY Col1, Col2, Col3
And that's it. No complexity at all.
If, for some reason, you need the database to be able to show the three fields concatenated together, you can always so it in the select statement, use a view or create a computed column.