Simplify the following text for a Grade 5 native English-speaking person.
Original: Nematomorpha ( sometimes called Gordiacea , and commonly known as horsehair worms or Gordian worms ) is a phylum of parasitic animals that are superficially morphologically similar to nematode worms , hence the name .
Simplified: They are sometimes called Gordiacea , and are also known as Horsehair worms .