Complex sentence: Alder left the area for political reasons when Königshütte became part of Poland in 1922, he studied chemistry at the University of Berlin from 1922, and later at the University of Kiel where his PhD was awarded in 1926 for work supervised by Diels.
Split into simpler sentences: Alder left the area for political reasons when Königshütte became part of Poland in 1922. He studied chemistry at the University of Berlin from 1922, and later at the University of Kiel where his PhD was awarded in 1926 for work supervised by Diels.