Simplify the following text for a Grade 11 native English-speaking person.
Original: Osteichthyes are a taxonomic superclass of fish , also called bony fish that includes the ray-finned fish ( Actinopterygii ) and lobe finned fish ( Sarcopterygii ) .
Simplified: Traditionally , the bony fish had been treated as a class within the vertebrates , with Actinopterygii and Sarcopterygii as subclasses . However , some recent works have elevated Osteichthyes to superclass , with Actinopterygii and Sarcopterygii as classes .