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// Another alternative is to use a couple of line breaks.

$creds = 'Copyright [footer_copyright] <a href="'.get_bloginfo( 'url' ).'">'.get_bloginfo( 'name' ).'</a><br/><br/>Developed by <a href="#">XYZ</a>';

// Keeping that in mind, to fix the markup problem we can use the workaround like so:

$creds = 'Copyright [footer_copyright] <a href="'.get_bloginfo( 'url' ).'">'.get_bloginfo( 'name' ).'</a></p><p>Developed by <a href="#">XYZ</a>';

// If you want to display a credit line below, in a new paragraph the code would be:

$creds = 'Copyright [footer_copyright] <a href="'.get_bloginfo( 'url' ).'">'.get_bloginfo( 'name' ).'</a><p>Developed by <a href="#">XYZ</a></p>';

// it may look okay on the front end, but the top line gets wrapped in p tags and empty p tags appear at the bottom.

// This is because the function content gets shown inside a <p> and </p> tags.

https://sridharkatakam.com/changing-footer-text-genesis-using-genesis_footer_creds_text-filter/

// Change the footer text
add_filter( 'genesis_footer_creds_text', 'sp_footer_creds_filter' );
function sp_footer_creds_filter( $creds ) {
    $creds = 'Copyright [footer_copyright] <a href="'.get_bloginfo( 'url' ).'">'.get_bloginfo( 'name' ).'</a>';
 
    return $creds;
}

// to get
// Copyright © 2016 My Super Duper Website