Complex sentence: Moreover, the report is some 45 years old, and in all likelihood, most of the suggestions and conclusions are no longer relevant; the question of how widely the report's conclusions were considered may remain an open question.
Split into simpler sentences: Moreover, the report is some 45 years old, and in all likelihood, most of the suggestions and conclusions are no longer relevant. The question of how widely the report's conclusions were considered may remain an open question.