please see you my try

        $myembed = htmlentities( (string)$feed_item->embed );                                       // hercules line
        $feed_item->desc = "ID: <h2>{$feed_item->title}</h2><br>\n{$myembed}<br>\n{$feed_item->desc}";   // hercules line
        // $feed_item->desc .= "<h2>{$feed_item->title}</h2>{$myembed}<br>{$feed_item->desc}";
            /* hercules 2 end */
        $post = array(
            'post_author'     => '1',
            'post_status'     => $_POST['status'],
            'post_type'       => $cpt,
            'post_title'      => (string) $feed_item->title,
            'post_content'    => (string) $feed_item->desc
            );
        $post_id = wp_insert_post( $post );
        update_post_meta($post_id, 'sponsor',      (string)$_POST['source']);
        update_post_meta($post_id, 'videoID',      (string)$feed_item->id);
        $post = array(                               // hercules line
          'post_content' =>  $feed_item->desc,     // hercules line
         );                                         // hercules line
          wp_insert_post($post_id);                 // hercules line