Complex sentence: The Fenian dynamite campaign (or Fenian bombing campaign) took place in Great Britain from 1881 to 1885 by the Irish Republican Brotherhood (IRB), nicknamed the "Fenians", on infrastructure and government, military and police targets.
Split into simpler sentences: The Fenian dynamite campaign (or Fenian bombing campaign) was a bombing campaign that took place in Great Britain from 1881 to 1885. It was carried out by the Irish Republican Brotherhood (IRB), nicknamed the "Fenians", who launched attacks on infrastructure as well as government, military and police targets.