Complex sentence: Robert W. Brooks (Washington, D.C., September 16,1952--Montreal, September 5,2002) was a mathematician known for his work in spectral geometry, Riemann surfaces, circle packings, and differential geometry.
Split into simpler sentences: Robert W. Brooks (b. Washington, D.C., 16-Sep-1952; d. Montreal, 5-Sep-2002) was a mathematician. He worked in spectral geometry, Riemann surfaces, circle packings, and differential geometry.