Complex sentence: William Philip Allen, Michael Larkin, and Michael O'Brien--were members of the Irish Republican Brotherhood, an organisation dedicated to ending British rule in Ireland, executed for the murder of a police officer in Manchester, England, in 1867.
Split into simpler sentences: William Philip Allen, Michael Larkin, and Michael O'Brien--were members of the Irish Republican Brotherhood, an organisation dedicated to ending British rule in Ireland. They were executed for the murder of a police officer in Manchester, England, in 1867.