Simplify the following text for a Grade 8 native English-speaking person.
Original: The Order Archaeognatha has previously been combined with the Order Thysanura , or bristletails , both of which groups possess three-pronged tails comprising two cerci and an epiproct .
Simplified: The Order Archaeognatha has previously been combined with the Order Thysanura , or bristletails . Both groups have three-pronged tails with two cerci and an epiproct .