I can’t insert any HTML tags (such as break tags <br> or span tags <span>) into the WordPress Tagline.

Here is a jQuery solution, add to themes/theme-name/global.js and call it in your theme stylesheet:
[codesyntax lang=”javascript”]
// Insert <br> into tagline
jQuery(document).ready(function(){
$("h2").each(function() {
var getContent=$(this).text();
var newString=getContent.replace('Poultry, Swine & Livestock Equipment Sales','<br />Poultry, Swine & Livestock Equipment Sales');
$(this).html(newString);
});
});
[/codesyntax]
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