The sleeve should just sldie off. I wish I saw this thread earlier, pretty much what happened was the bearings were shot and then run for a while after that. This creates a lot of heat, which tends to seize everything up. When I did my bike, I just chucked the whole axle, carrier, sprocket and rotor because it was so bad.
When/if you put it back together, tap a grease fitting into the carrier, and lube it every couple of rides. Also, Use a shit ton of PB Blaster and you should be able to break the sleeve from the axle, and maybe have a shot at getting the other bearing out of the carrier.
Good luck bro!