Remove Since last logging in there have been …

Yes possible. Go to sb-login/template/logged-in.php

Than find this code and remove it

echo '<p>';
		echo _n('Since last logging in there has been ', 'Since last logging in there have been ', $posts,'ninety');
		echo '<span class="count">'.$posts.'</span>';
		echo _n('new post and ', 'new posts and ', $posts,'ninety');
		echo '<span class="count">'.$comments.'</span>';
		echo _n('new comment', 'new comments', $comments, 'ninety');