Complex sentence: For these inventions he holds thirty nine United States patents as well as eighty international patents... in the 1920s and 1930s Crosthwait invented a vacuum pump, a boiler, and a thermostat control, all for more effective heating systems for larger buildings.
Split into simpler sentences: For these inventions he holds thirty nine United States patents as well as eighty international patents. In the 1920s and 1930s Crosthwait invented a vacuum pump, a boiler, and a thermostat control, all for more effective heating systems for larger buildings.