Complex sentence: This term is mostly used to refer to Cantonese culture, which here includes culture of Hong Kong and culture of Macau, due to the fact that the people of Hong Kong and Macau also primarily speak Cantonese.
Split into simpler sentences: This term is mostly used to refer to Cantonese culture. Here, this term includes culture of Hong Kong and culture of Macau, due to the fact that the people of Hong Kong and Macau also primarily speak Cantonese.