Complex sentence: Charles Thomas Heycock FRS (21 August 1858--3 June 1931) was an English chemist and soldier who was awarded the Davy Medal in 1920 "on the ground of his work in physical chemistry and more especially on the composition & constitution of alloys".
Split into simpler sentences: Charles Thomas Heycock FRS (1858-1931) was a British chemist and soldier who was awarded the Royal Society's Davy Medal in 1920. He was awarded the Royal Society's Davy Medal in 1920, "on the ground of his work in physical chemistry and more especially on the composition & constitution of alloys".