Complex sentence: It was organised by Jimmie Durham, head of the International Indian Treaty Council, with Mapuche leaders exiled from Chile under Pinochet and supported by the American activist Roxanne Dunbar-Ortiz.
Split into simpler sentences: It was organised by Jimmie Durham, head of the International Indian Treaty Council, with Mapuche leaders exiled from Chile under Pinochet. They were also supported by the American activist Roxanne Dunbar-Ortiz.