@Anonymous , Use Initialize Variable action, give name of variable, set the variable type to Array, use following expression to split the emails, replace variables('Emails') with the dynamic content expressions on which your emails with semicolons are stored.
split(variables('Emails'),';')
Then loop through the Array variable to send email separately to each email address.
If you want to send one email to all email addresses then you dont need to split semicolon separated emails, you can directly use it in To property of Send Email action using Dynamic Content.
