A known topic can be introduced as a subject, followed by a clause that adds new information about it. The predicate then attaches to an already salient referent.
وَكَوْنُهُ مَعْلُومًا مِمَّا سَبَقَ
And its being already known from what preceded.
The issue is not merely the number of words. By the time the clause arrives, the listener already knows whose circumstances are under discussion, allowing the new assertion to be interpreted with that discourse context.