Complex sentence: After Adolf Hitler and the Nazi Party came to power in 1933, Breitscheid emigrated to France; in 1941, approximately a year into the German occupation of France, he was arrested by the Gestapo and interned in the infamous concentration camp Buchenwald.
Split into simpler sentences: After Adolf Hitler and the Nazi Party came to power in 1933, Breitscheid emigrated to France. These efforts were not successful, and in 1941, approximately a year into the German occupation of France, he was arrested by the Gestapo and interned in the infamous concentration camp Buchenwald.