Complex sentence: From 1951--1954, he worked for Siemens selling vacuum cleaners and together with his family he moved to Stuttgart, but he was not satisfied with his regular life and the relative prosperity it gave him.
Split into simpler sentences: From 1951--1954, he worked for Siemens selling vacuum cleaners. He moved his family to Stuttgart, but he was not satisfied with his regular life and the relative prosperity it gave him.