Complex sentence: Michael Meredith Swann, Baron Swann, FRS FRSE (1920--22 September 1990) was a distinguished molecular and cell biologist working on the mechanisms of cell division and fertilisation.
Split into simpler sentences: Michael Meredith Swann, Baron Swann, FRS FRSE (1920--22 September 1990) was a distinguished molecular and cell biologist. Swann's academic work was on the mechanisms of cell division and fertilisation.