Complex sentence: One of the firemen, Trevor Stratford, said the men made their way up an enclosed staircase, with Serial 502 behind them, when suddenly rioters appeared at the top, blowing whistles and throwing bottles.
Split into simpler sentences: One of the firefighters, Trevor Stratford, said the men made their way up an enclosed staircase, with Serial 502 behind them. Suddenly rioters appeared at the top, blowing whistles and throwing bottles.