Click any Campaign name on the Campaigns page to take you to the Campaign overview page. Each page displays details of your Campaign, including the number of Contacts that have been added to the Campaign, the number of Emails sent, the number of page views resulting from the Campaign, and more.
The Recent Activity panel on the right displays the recent activities that take place in the Campaign.
You can also see if a contact was sent a campaign by going on to their profile and looking under their recent activities.