Complex sentence: Association football is simply known as "football" in most of the countries, except where other codes of football are dominant, including: the United States, Canada, Australia, and New Zealand, where it is known as "soccer".
Split into simpler sentences: Association football is simply known as "football" in most of countries, except where other codes of football are dominant. Examples of such countries include the United States, Canada, Australia, and New Zealand, where it is known as "soccer".