Complex sentence: The final peace agreement was celebrated with a "Flame of Peace" in which weapons were burned in Agadez on 25 September 2000, a date that is also commemorated each year in some communities.
Split into simpler sentences: The final peace agreement was celebrated with a "Flame of Peace" in which weapons were burned in Agadez on 25 September 2000. This date is also commemorated each year in some communities.