Simplify the following text for a Grade 9 native English-speaking person.
Original: Printer Command Language , more commonly referred to as PCL , is a page description language ( PDL ) developed by Hewlett-Packard as a printer protocol and has become a de facto industry standard .
Simplified: The Printer Command Language ( often shorened to PCL ) is a page description language , developed by Hwelett-Packard .