Complex sentence: Macedonian nationalism is a general grouping of nationalist ideas and concepts among ethnic Macedonians that were first formed in the late 19th century among separatists seeking the autonomy of Macedonia from the Ottoman Empire.
Split into simpler sentences: Macedonian nationalism is a general grouping of nationalist ideas and concepts among ethnic Macedonians that were first formed in the late 19th century. The concept began in the 19th century among separatists seeking the autonomy of Macedonia from the Ottoman Empire.