Complex sentence: After the creation of the People's Republic of Macedonia many Macedonians left to help rebuild the devastated country, while thousands of Aegean Macedonian refugees came to Australia, of which a large proportion settled in Perth.
Split into simpler sentences: After the creation of the People's Republic of Macedonia many Macedonians left to help rebuild the devastated country. While thousands of Aegean Macedonian refugees came to Australia, of which a large proportion settled in Perth.