When that was covering the Lote-Tree, which was covering.
The whole place was overwhelmed.
When there comes to the Lote Tree, that which come
When that which covers covered the lote-tree
When what covers/darkens covers/darkens the lote-tree
The Lote-tree was shrouded
When the lote-tree was being enveloped, by whatever around it
This was when that, which covers, covered the lote-tree
When theophanies (i.e., effulgent disclosures) of the divine light wrapped up al-Sidra (the Lote-Tree at the Far End), covering it expansively.
(This was) when the sublime thing (- the Divine Manifestation) which was to cover Sidrah had covered it
When that covered the lote-tree which did cover it