Complex sentence: He was made an instructor in electrical engineering in 1911 and got a position as assistant professor of physics in 1917, in 1923 he became an associate professor and a professor in 1926.
Split into simpler sentences: He was made an instructor in electrical engineering in 1911 and got a position as assistant professor of physics in 1917. In 1923 he became an associate professor and a professor in 1926.