Complex sentence: One small packet of ashes was scattered at a 1989 ceremony which unveiled a monument to six unarmed IWW coal miners buried in Lafayette, Colorado, who had been machine-gunned by Colorado state police in 1927 in the Columbine Mine Massacre.
Split into simpler sentences: One small packet of ashes was scattered at a 1989 ceremony which unveiled a monument to IWW coal miners buried in Lafayette, Colorado. Six unarmed strikers were machine-gunned by Colorado state police in 1927 in the Columbine Mine Massacre.