Complex sentence: Devon is later reviewing photographs taken of stars at different periods in time and discovers that the star of the alien world went ultraviolet 40 years in the past and brings this information to his superiors and the military.
Split into simpler sentences: Devon is later reviewing photographs taken of stars at different periods in time and discovers that the star of the alien world went ultraviolet 40 years in the past. He brings this information to his superiors and the military.