Complex sentence: Dresser's packer was one of many available on the market, and it was another invention that put his company on the map--a coupling that he built in 1885 to join pipes together in such a way that they would not leak natural gas.
Split into simpler sentences: Dresser's packer was merely one of many available, and it was not that invention, but another, that put his company on the map. This was a coupling that Dresser built in 1885 to join pipes together in such a way that they would not leak natural gas.