Complex sentence: Prior to 1922, Doctors McCray and McClintic both died while doing research on Rocky Mountain Spotted Fever, as did an aide of Noguchi Hideyo at the Rockefeller Institute.
Split into simpler sentences: Prior to 1922, Doctors McCray and McClintic both died while doing research on Rocky Mountain Spotted Fever. Also did an aide of Noguchi's at the Rockefeller Institute.