Complex sentence: Between 20 and 26 July 1941, local KPJ leaders organised three Partisan detachments in the immediate vicinity of Drvar, one of which was the Kamenica Detachment; which together possessed around 200 rifles and 7 light machine guns.
Split into simpler sentences: Between 20 and 26 July 1941, local KPJ leaders organised three Partisan detachments in the immediate vicinity of Drvar. One of these was the Kamenica Detachment, which possessed around 200 rifles and 7 light machine guns.