Complex sentence: The Norwegian national under-17 football team, controlled by the Football Association of Norway, is the national football team of Norway for players of 17 years of age or under at the start of a UEFA European Under-17 Football Championship campaign.
Split into simpler sentences: The Norwegian national under-17 football team, controlled by the Football Association of Norway, is the national football team of Norway. The team is for players of 17 years or under at the start of a UEFA European Under-17 Football Championship campaign.