The history of MailChimp campaigns a Contact is involved in will be available within the Contact's Salpo CRM profile page.
Every contact profile displays a MailChimp tab when the integration is active. The tab contains information such as: the lists the Contact is subscribed to, the campaigns the Contact has been sent and a record of any opens or clicks, plus a link to view the campaign in MailChimp.
Use the navigation icon to open the synced MailChimp account and view the list of Contacts associated with that campaign. Subscribe the individual Contacts to a new mailing lists using the Add drop-down.