Convert this can to a "standard" light socket?
Clipped to the roof of the cans are standard bulb sockets, which would normally have been installed in your choice of trim ring. Because those LED rings don't use standard bulb bases, an adapter is screwed into the bulb sockets. You'd just unclip those and snap them into your new trim rings, like shown here: 



Unscrew and discard the adapter plug that's threaded into them.