Complex sentence: In 1923, a runaway tram ran down Churwell Hill and ended in tragedy: six people were killed and 35 injured when the brakes failed and the tram crashed into a field wall at Cottingley.
Split into simpler sentences: In 1923, a runaway tram ran down Churwell Hill and ended in tragedy. Six people were killed and 35 injured when the brakes failed and the tram crashed into a field wall at Cottingley.