Yes, Gorwingel, that's right. Sauron lost so much of his power when the Ring was destroyed that he was diminished to a shadow of evil, never able to rise or take shape again. Also, Sauron didn't put
all of his power into the Ring, just a very great part of it. Enough that when that power was destroyed he no longer had enough power to rise or take shape again.
And now I have gone in a complete circle and am repeating myself.