Creating A Form With Multi Select

I am trying to create a form where you may have more than one person
at a meeting, but want to have them be related to the same meeting.

I have a mulitple select text area and if you select more than one,
all the records are being added to the same row. so if I picked the
following three people:

(Person ID/Desc)
1 - mickey mouse
2 - donald duck
3 - goofy

The row in the data base would look like this:

(Meeting ID/ Person ID)

1 - 1,2,3

But I would like to do this:
(Meeting ID/ Person ID)
1 - 1
1 - 2
1 - 3

I hope this makes sense, if it does does anyone have a suggest on how to best do this?