Could you please fix this sentence for me?

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@HANUer "asleep" is a special kind of adjective that can only be used after the noun by saying something like "the children are asleep". You can't use "asleep" to modify a noun the way you might with an adjective like "beautiful" or "scared". We sometimes call adjectives like "asleep" predictive adjectives, because they can only be used after predicate verbs like "be" and we can't put them before the noun. We instead have to use other forms to communicate the same thing, in this case "sleeping".

"the crash of thunder" isn't wrong and you can say that in this sentence, but there's no reason to change "the crashing thunder" because it isn't incorrect.