Complex sentence: The Dolomite Declaration was adopted by the mostly communist led OF in Slovenia on March 1st, 1943, which gave the communist party of Slovenia (KPS) exclusive leadership of resistance against fascism.
Split into simpler sentences: The Dolomite Declaration was adopted by the mostly communist led OF in Slovenia on March 1st, 1943. It gave the communist party of Slovenia (KPS) exclusive leadership in resistance against fascism.