Complex sentence: Nevertheless, "Scientific American" advised in September 1860 the Parisian newspaper "Cosmos" had pronounced the steam age over, and by 1865,143 had been sold in Paris alone, and production by Reading Gas Works for Lenoir Gas Engines in London had begun.
Split into simpler sentences: Nevertheless, "Scientific American" reported, in September 1860, that the Parisian newspaper "Cosmos" had pronounced the steam age over. By 1865,143 had been sold in Paris alone, and production of Lenoir Gas Engines, by Reading Gas Works, in London had begun.