Complex sentence: Donkin was also a contributor to the Philosophical Magazine "," his last paper in which, a "Note on Certain Statements in Elementary Works concerning the Specific Heat of Gases" appeared in 1864.
Split into simpler sentences: Donkin was also a contributor to the "Philosophical Magazine". His last paper, a "Note on Certain Statements in Elementary Works concerning the Specific Heat of Gases", appeared in 1864.