Complex sentence: Despite such Macedonian historical interpretations, Delchev had Bulgarian identity and viewed his compatriots as Bulgarians, but contrary to the Bulgarian assertions, his autonomist ideas have stimulated the development of the contemporary Macedonian nationalism.
Split into simpler sentences: Despite such Macedonian historical interpretations, Delchev had Bulgarian national identity and viewed his compatriots as Bulgarians. However, contrary to the Bulgarian assertions, his autonomist ideas have stimulated the development of the contemporary Macedonian nationalism.