Complex sentence: Since then, it has been described as a thriving football league, organized by former football players and aficionados, and a total of 21 clubs have competed in UFL Division 1 since its founding.
Split into simpler sentences: Since then, it has been described as a thriving football league, organized by former football players and aficionados. A total of 21 clubs have competed in UFL Division 1 since its founding.