Complex sentence: From the late 1970s it had also been adopted by many both in Greece and the then Socialist Republic of Macedonia to symbolise historical connections with ancient Macedonia and had been paraded in demonstrations by Greeks and ethnic Macedonians at home and abroad.
Split into simpler sentences: From the late 1970s it had been adopted by the then Socialist Republic of Macedonia to allege a historical connection with ancient Macedonia. It has also been paraded in demonstrations by Greeks and ethnic Macedonians at home and abroad.