Complex sentence: Karl-Hermann Geib and Jerome S. Spevack independently, and in parallel, invented the process in 1943 and its name derives from the Girdler company, which built the first American plant using the process.
Split into simpler sentences: Karl-Hermann Geib and Jerome S. Spevack independently invented the process in the early 1940s. The name derives from the Girdler company, which built the first American plant using the process.