Simplify the following text for a Grade 10 native English-speaking person.
Original: The fish had been buried when trapped in a pool of water that dried up , stranding two armored antiarch placoderms , Remigolepis walkeri and Bothriolepis yeungae , and Canowindra grossi , a lobe-finned crossopterygian fish , with two rare juvenile arthrodire placoderms , Groenlandaspis species .
Simplified: The fish found were two armored antiarch placoderms , Remigolepis walkeri and Bothriolepis yeungae . They also found Canowindra grassi , a lobe-finned crossopterygian fish , with two rare young arthrodire placoderms , Groenlandaspis species .