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What colors are the wires going into the back of the outlet?
If you're not comfortable answering that question, stop now and call an electrician.
If they're black and white, piece of cake, pull the old 220 breaker, move the white wire to the common bar, put the black one on a new single pole breaker, replace the outlets, done.
If they're black and red, you can do the same thing but using red for a common is not to code, so if someone else has to service it later they will curse you.
If it is a 4 wire 220 with black, red, white, and green, then you can just rewire and not use the red, wirenut both ends. But since you said it's an old install it's unlikely it's 4 wire.
Disclaimer: I am not an electrician, I have electrocuted myself however not lately, and I despise arc fault breakers.
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