SPLIT and REJOIN Data in Sharepoint List

I have list that has a column that contains names in SharePoint.  I want to be able to SPLIT out the names and then rejoin them back to their parent fields.  Normally for SQL I'd think of doing this with a JOIN.  I'm not really sure how to do this with SharePoint.

Example Users:

LastName, Vamshi K.;#923;#LastName, Paul C.;#924;#LastName, ^Richard R.;#20;#LastName, ^Vincent M Sr.;#925;#LastName, Reagan N.;#926;#LastName, John F.;#108;#LastName, John

I'm thinking I need to remove all the numbers and # signs then split the semicolon.  Then somehow maybe an IIF or something.

The ultimate goal is group by the users name and display all the related columns the name is in.

David Jenkins