Simplify the following text for a Grade 11 native English-speaking person.
Original: The California Tiger Salamander ( Ambystoma californiense ) , the Barred Tiger Salamander ( Ambystoma mavortium ) , and the Plateau Tiger Salamander ( Ambystoma velasci ) , were all once subspecies of A. tigrinum , but are now considered separate species .
Simplified: The California Tiger Salamander ( Ambystoma californiense ) , the Barred Tiger Salamander ( Ambystoma mavortium ) , and the Plateau Tiger Salamander ( Ambystoma velasci ) , were all once subspecies of A. tigrinum , but are now separate species .