Complex sentence: The election on 20 May 1928 produced a shift to the left, although the Nazis managed to elect a handful of deputies.However forming a new government was challenging, because several parties were reluctant to participate.
Split into simpler sentences: The election on 20 May 1928 produced a shift to the left, although a handful of Nazis were elected. However it was difficult to assemble a new government because several parties were reluctant to participate.