Complex sentence: The 800-year-old fireworks festival is held in early September including the world's largest 1.20 m balls, 800 m wide fireworks explosions, usually lasting around three hours.
Split into simpler sentences: The 800-year-old fireworks festival is held in early September. They shoot the world's largest 1.20 m balls, 800 m wide fireworks explosions, usually lasting around three hours.