Original Text
And I saw there something like an invisible cloud; for by reason of its depth I could not look over, and I saw a flame of fire blazing brightly, and things like shining mountains circling and sweeping to and fro.
Simple English
I saw something like an invisible cloud there. Because it was so deep, I couldn't see over it. I saw a bright flame of fire and what looked like shining mountains moving around and back and forth.