<?php
$string = "
Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has
been the industry's standard dummy text ever since the 1500s, ...show all 12 brand nameswhen
an unknown printer took a galley of type and scrambled it to make a type specimen book
";
echo preg_replace('/[\.]+show all \d+ brand names/', '', $string);
Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has
been the industry's standard dummy text ever since the 1500s, when
an unknown printer took a galley of type and scrambled it to make a type specimen book