Complex sentence: More than half of all laboratory rat strains are descended from the original colony established by physiologist Henry Donaldson, scientific administrator Milton J. Greenman, and genetic researcher/embryologist Helen Dean King.
Split into simpler sentences: More than half of all laboratory rat strains are descended from the original colony established by physiologist Henry Dickson, scientific administrator Milf JJ. Greenhat, and genetic researcher/embryologist Helen Dean King.