Complex sentence: He predicts a doomsday scenario unless there is an immediate understanding of the forthcoming global cooling and certain steps are put into place which will allow the people far from the equator, those in most danger, to adapt to this future event.
Split into simpler sentences: He predicts a doomsday scenario unless there is an immediate comprehension of the forthcoming global cooling. He says certain steps should be put into place which will allow the people far from the equator, those in the most danger, to adapt to this future event.