I would tell them exactly what you've told us and not try to mitigate it. And emphasize that you feel rejuvenated. Having taken this break, you may be in a be

I would tell them exactly what you've told us and not try to mitigate it. And emphasize that you feel rejuvenated. Having taken this break, you may be in a better spot now than many people who have been (formally) employed continuously for the same time.