Complex sentence: Initially, the Nazi party had few followers and votes in working-class-dominated Ludwigshafen, but after 1933, when they had come to power in Germany, the Nazis succeeded in enforcing their policies in Ludwigshafen.
Split into simpler sentences: Initially, the Nazi party had few followers and votes in working-class-dominated Ludwigshafen. But after 1933, when they had come to power in Germany, the Nazis succeeded in getting their ideas through in Ludwigshafen.