Complex sentence: Boron carbide was first synthesized by Henri Moissan in 1899, by reduction of boron trioxide either with carbon or magnesium in presence of carbon in an electric arc furnace.
Split into simpler sentences: Boron carbide was first synthesized by Henri Moissan in 1899. It is prepared by reduction of boron trioxide either with carbon or magnesium in presence of carbon in an electric arc furnace.