تَفَرَّقتُمُyou scattered أَنto تُدرِكواovertake الحَيَّthe tribe بيضَةًas one body (literally, an egg)
تَفَرَّقتُمُ أَن تُدرِكوا الحَيَّ بيضَةً
فَظَلَّso there lasted لَكُمfor you يَومٌa day إِلىuntil اللَيلِthe night أَشنَعُmore dreadful
فَظَلَّ لَكُم يَومٌ إِلى اللَيلِ أَشنَعُ
You scattered to overtake the tribe, whole as an egg;
You scattered to catch the living as a white egg
So a more dreadful day lasted for you until night.
So a day remains for you until night most atrocious
Sol 6.1