Simplify the following text for a Grade 8 native English-speaking person.
Original: These tentacles are arranged into two circles and , unlike the tentacles of other cephalopods , they have no suckers , are undifferentiated and retractable .
Simplified: These tentacles are arranged into two circles . Unlike the tentacles of other cephalopods , they have no suckers , and are all the same , and retractable .