Complex sentence: James Frederic Danielli (1911-1984) was an English biologist famous for research on the structure and the permeability of cell membranes, developing a physical-chemical model in collaboration with the physiologist Hugh Davson.
Split into simpler sentences: James Frederic Danielli (1911-1984) was an English biologist. He was famous for research on the structure and the permeability of cell membranes, developing a physical-chemical model in collaboration with the physiologist Hugh Davson.