Complex sentence: Orgatron was manufactured by Everett Piano Company from 1935 to 1941, and then by Rudolph Wurlitzer Company from 1945 to 1961, including some models using the Everett name from 1945 to 1947.
Split into simpler sentences: Orgatron was manufactured by Everett Piano Company from 1935 to 1941. Following World War II and a business transfer, production resumed in 1945 by the Rudolph Wurlitzer Company and continued into the early 1960s, including some models retaining the Everett name from 1945 to 1947.