I don't see why you couldn't leave the airport.
Obviously he'll have to go through security once more. So make sure he has his tickets/ID/Passport ready. I would think that his checked luggage would be put into holding till the connecting flight arrives (as long as it's not two separate tickets). So he shouldn't have to claim then re-check that (not positive though, as I typically travel with only a carry-on). If he has any carry-on luggage, he will have to lug that around.
He should check and verify that a visa isn't required to enter the country.
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