YOU SAID:
They give birth astride of a grave, the light gleams an instant, then it's night once more.
INTO JAPANESE
彼らは墓のまたがって出産、光光る一瞬、それは夜をもう一度。
BACK INTO ENGLISH
They instantly across the tomb and birth, light shining evening again's.
That didn't even make that much sense in English.