The simulator is not less complex, the difference is that the simulator is not subjected to the same limitations/rules/laws of our universe. You either choose

The simulator is not less complex, the difference is that the simulator is not subjected to the same limitations/rules/laws of our universe. You either choose the universe itself to be infinite (always have and always will exist) which contradicts all our observations about it, or you assume a higher entity (outside the universe) that is infinite (always have and always will exist). The third option (nothing infinite) means we wouldn't exist at all, because if there's no "start" then you go into an infinite loop trying to find a start and nothing happens. But since we are actually here, then third option is out, and only the second option (higher entity) makes logical sense.