Complex sentence: Ancel Keys was the lead investigator of the Minneapolis Starvation Experiment and was responsible general supervision of the activities in the Laboratory of Physiological Hygiene and was directly responsible for the X-ray analysis and administrative work for the project.
Split into simpler sentences: Ancel Keys was the lead investigator of the Minneapolis Starvation Experiment. He was responsible for the general supervision of the activities in the Laboratory of Physiological Hygiene and was directly responsible for the X-ray analysis and administrative work for the project.