Send email to multi user address in workflow

Hi all,

We have a field (Project admin) in the K2 form and stored dynamic multi email address based on user selection.  

The field is store the email address in this way (simon@abc.com;keith@abc.com;jack@abc.com)

Now, we want the workflow notice & the reminder function can send to these people directly based on the information which the field (Project admin)stored.

May I know how can we achieve that?

Thank you