Remove <span> in Yoast breadcrumbs before the <li> tags

breadcrumbs-list.php

<?php

/**
 * Filter the output of Yoast breadcrumbs to remove <span> tags added by the plugin
 * @param $output
 *
 * @return mixed
 */
function louise93_yoast_breadcrumb_output( $output ){

	$from = '<span>';
	$to = '</span>';
	$output = str_replace( $from, $to, $output );

	return $output;
}
add_filter( 'wpseo_breadcrumb_output', 'louise93_yoast_breadcrumb_output' );


/**
 * Shortcut function to output Yoast breadcrumbs
 * wrapped in the appropriate markup
 */
function louise93_breadcrumbs() {
	if ( function_exists('yoast_breadcrumb') ) {
		yoast_breadcrumb('<ul>', '</ul>');
	}
}