Complex sentence: The winner of the PoV competition wins the right to either revoke the nomination of one of the nominated HouseGuests or leave them as is; if the veto winner uses this power, the HoH must immediately nominate another HouseGuest for eviction.
Split into simpler sentences: The winner of the PoV competition wins the right to either revoke the nomination of one of the nominated HouseGuests or leave them as is. If the veto winner uses this power, the HoH must immediately nominate another HouseGuest for eviction.