Split titles at pipe

functions.php

<?php

class f {

  static function s() {
    add_filter( 'the_title', __CLASS__ . '::split_product_title_at_pipe' );
  }

  static function split_product_title_at_pipe( $title ) {
    if ( ! is_product() ) {
      return $title;
    }
    // Split the title at a pipe
    $substrings = explode( ' | ', $title );
    $title = ( ! empty( $substrings[0] ) ) ? $substrings[0] . '<span class="title-byline">' . $substrings[1] . '</span>' : $title;
    return $title;
  }
}

f::s();