Simplify the following text for a Grade 6 native English-speaking person.
Original: The Exopterygota , also known as Hemipterodea , are a superorder of insects of the subclass Pterygota in the infraclass Neoptera , in which the young resemble adults but have externally-developing wings .
Simplified: The Exopterygota are a superorder of insects . They are in the subclass Pterygota in the infraclass Neoptera .