Complex sentence: The election took place after the Nazi "Machtergreifung" of 30 January when President Paul von Hindenburg had appointed Hitler Chancellor, who immediately urged the dissolution of the Reichstag and the arrangement of new elections.
Split into simpler sentences: The election took place after the Nazi seizure of power of 30 January, when President Paul von Hindenburg appointed Hitler as Chancellor. The latter immediately urged the dissolution of the Reichstag and the calling of new elections.