What is incumbent upon one who slept before noon and did not wake up until 10:00 PM, and neither broke his fast nor prayed?

Your waking up at ten means you have to make up the Dhuhr, Asr, Maghrib, and Isha prayers in order, and there is no sin upon you for that, because sleep is an excuse. "There is no negligence in sleep," and the expiation for one who forgets a prayer or sleeps through it is to pray it when he remembers it. As for not having broken your fast until you woke up, the matter is simple and there is nothing upon you.