Complex sentence: The Chemex Coffeemaker is a manual, pour-over style glass-container coffeemaker, which Peter Schlumbohm invented in 1941, and which continues to be manufactured, by the Chemex Corporation in Pittsfield, Massachusetts.
Split into simpler sentences: The Chemex Coffeemaker is a manual, pour-over style coffeemaker. It was introduced, and continues to be manufactured, by the Chemex Corporation in Pittsfield, Massachusetts.