A. Yusuf Ali:Translation:
(It is) a Qur´an which We have divided (into parts
from time to time), in order that you mightest recite
it to men at intervals: We have revealed it by
stages. 2317

Muhammad Asad:Translation:
[bearing] a discourse which We have gradually unfolded, 128 so that thou might read it out to mankind by stages, seeing that We have bestowed it from on high step by step, as [one] revelation. 129
2317 The marvel is that these parts, revealed at different times and in different circumstances, should fit together so closely and consistently as they do. All revelation is progressive. The previous revelations were also progressive. Each of them marked a stage in the world's spiritual history. Man's mind does not take in more than his spiritual state will have prepared him for. Allah's revelation comes as a light to illuminate our difficulties and show us the way in actual situations that arise.