Complex sentence: Janet Elizabeth Lane-Claypon (1877--1967) was an English physician and one of the founders of the science of epidemiology, pioneering the use of so-called cohort studies and case-control studies.
Split into simpler sentences: Janet Elizabeth Lane-Claypon (1877--1967) was an English physician. She was one of the founders of the science of epidemiology, pioneering the use of so-called cohort studies and case-control studies.