Complex sentence: She was arrested in Preston in 1909 when she took part in a protest at a meeting addressed by Winston Churchill and again when, on her release, she followed Churchill to Waterloo in Liverpool, where she smashed a window at the local police station.
Split into simpler sentences: She was arrested again when she took part in a protest at a meeting addressed by Winston Churchill in Preston in 1909. On her release, she followed Churchill to Waterloo in Liverpool, where she smashed a window at the local police station.