Original Text
And there shall be a light that never endeth, And to a limit (lit. 'number') of days they shall not come, For the darkness shall first have been destroyed, [And the light established before the Lord of Spirits] And the light of uprightness established for ever before the Lord of Spirits. LIX. The Lights and the Thunder.
Simple English
There will be a light that never ends, and they will not have a set lifespan, for darkness will be destroyed first, and the light of righteousness will be established forever before the Lord of Spirits.