Simplify the following text for a Grade 10 native English-speaking person.
Original: The trend towards differentiation is found in some labyrinthodonts and early anapsid reptilians in the form of enlargement of the first teeth on the maxilla , forming a form of proto-canines .
Simplified: The trend towards differentiation is found in some labyrinthodonts and early anapsid reptilians . Thet have enlarged first teeth on the maxilla , forming a form of proto-canines .