Complex sentence: From September 12 to 16,2004, one faction of Winnemem Wintu held a "war dance" as a protest.It was the first war dance held since 1876.
Split into simpler sentences: From September 12 to 16,2004, one faction of Winnemem Wintu held a "war dance" as a protest. They claim it was the first war dance held since 1876.