How should I translate this
Hello
I have found a strange sentence here:
"Of Robert Harding and the rest of his family nothing is known. The house retains its evil reputation, but the replanted vine is as orderly and well-behaved a vegetable as a nervous person could wish to sit under of a pleasant night, when the katydids grate out their immemorial revelation and the distant whippoorwill signifies his notion of what ought to be done about it."
If I was going to translate "when the katydids grate out their immemorial revelation and the distant whippoorwill signifies his notion of what ought to be done about it."
How should I translate it? Literally? It wouldn't make any sense though.