Complex sentence: In many cultures around the world, dating is a serious family matter, which is based on its culture and social values; where parents believe in arranged marriage or at least to make sure that their children get marry at certain age.
Split into simpler sentences: In many cultures around the world, dating is a serious family matter, which is based on its culture and social values. Parents in said cultures believe in arranged marriage, or at least make sure that their children get married at a certain age.