Complex sentence: The end of World War I, in 1918, brought about the breakup of the multinational Austro-Hungarian Empire into its historical particles, one of them being Bohemian kingdom, forming western part of newly created Czechoslovakia.
Split into simpler sentences: The end of World War I, in 1918, brought about the breakup of the multinational Austro-Hungarian Empire into its historical particles. One of them being Bohemian kingdom, forming western part of newly created Czechoslovakia.