Complex sentence: On April 16,1920, ethnic Germans from the Banat sent a request to the Paris Peace Conference asking for the re-establishment of the Republic under name of the Republic of Banatia, to include not only the Banat, but also neighbouring region of Bačka.
Split into simpler sentences: On April 16,1920, ethnic Germans from the Banat sent a request to the Paris Peace Conference asking for the re-establishment of the Republic under name of the Republic of Banatia. According to the request, this new republic would include not only the Banat, but also neighbouring region of Bačka.