Then something going round from your Lord went round it while they were asleep.
A passing (storm) from your Lord passed by it while they were asleep.
Then, a visitation from your Lord came down upon it while they slept
But a visitation from thy Lord came on it, while they slept
So a circler/walker (twister/tornado) circled/walked on them, and (while) they are sleeping/quiet/ still
While they were sleeping your Lord send a storm which destroyed their garden
So an envoy from your Lord completed his round upon the garden, whilst they were sleeping
Then a visitation from thy Lord visited it while they were asleep
So a whirl (of disaster) from your Lord went round (that garden during the night) whilst they were asleep
So a sudden and awful visitation (a calamity) from your Lord visited it while they were asleep
Then there passed by on the (garden) something (fire) from your Lord at night and burnt it while they were asleep