function my_custom_header_text() { ?>
<div class="my-custom-class clr">Some Text, could be anything though</div>
<?php }
add_action( 'wpex_hook_site_logo_inner', 'my_custom_header_text', 40 );
Snippets: Add Subheading Under Logo
Result:

function my_custom_header_text() { ?>
<div class="my-custom-class clr">Some Text, could be anything though</div>
<?php }
add_action( 'wpex_hook_site_logo_inner', 'my_custom_header_text', 40 );