<tr ng-repeat="site in dT.data.sites">
                    <td>{{ site.siteName }}</td>
                    <td><span ng-repeat="country in site.countries">{{ country.country + ' '}}<br><br></span></td>
                    <!-- Does not work -->
                    <td><span ng-repeat="country in site.countries">{{ country.masters.name }}</span></td>
                    <!-- Works, but displays only the first element of the array because of the [0] -->
                    <td><span ng-repeat="country in site.countries">{{ country.masters[0].name }}</span></td>
                    <!-- Does not work -->
                    <td><span ng-repeat="master in site.countries.masters">{{ master.name }}</span></td>
                    <td></td>
                    <td></td>
</tr>

<td><span ng-repeat="country in site.countries"><span ng-repeat="master in country.masters">{{ master.name }}<br /></span></span></td>