Complex sentence: Through clinical-pathological research, Lancereaux believed that the cause of diabetes mellitus was located in the pancreas, publishing in 1877 a paper in which he coined the term "diabète pancréatique" (pancreatic diabetes).
Split into simpler sentences: Through clinical-pathological research, Lancereaux believed that the cause of diabetes mellitus was located in the pancreas. In 1877 he published a paper in which he coined the term "diabète pancréatique" (pancreatic diabetes).