Complex sentence: Another way of deriving some sort of electromagnetic mass was based on the derivation of radiation pressure by James Clerk Maxwell (1874) and Adolfo Bartoli (1876).
Split into simpler sentences: Another way of deriving some sort of electromagnetic mass was based on the concept of radiation pressure. These pressures or tensions in the electromagnetic field were derived by James Clerk Maxwell (1874) and Adolfo Bartoli (1876).