Complex sentence: The actions and persistence of the Mother's Movement helped lead to the Great Sedition Trial of 1944, in which the government charged the defendents with preaching Nazism, racism, anti-Semitism and anti-communism.
Split into simpler sentences: The actions and persistence of the Mother's Movement helped to lead to the Great Sedition Trial of 1944. The Great Sedition Trial was a political trial in which the government prosecution specifically charged the defendants (Nazi followers) with preaching National Socialism, race prejudice, anti-Semitism and anti-communism.