echo "<span class='copyright'>".__('&copy; Copyright','avia_framework')." <a href='".home_url('/')."'>".get_bloginfo('name')."</a></span>";



change it to

echo "<span class='copyright'>".__('&copy; Copyright','avia_framework')." <a href='".home_url('/')."'>".get_bloginfo('name')."</a><br>Partners<a href'http://www.vinywall.nl/'>Vinymall</a> <a href='http://www.mozawall.nl/'>Mozawall</a></span>";