Simplify the following text for a Grade 10 native English-speaking person.
Original: Dictyoptera includes three groups of polyneopterous insects - cockroaches ( Blattaria ) , termites ( Isoptera ) and mantids ( Mantodea ) .
Simplified: Dictyoptera includes three orders of insects -- cockroaches ( Blattaria ) , termites ( Isoptera ) and mantids ( Mantodea ) .