Complex sentence: The communist Yugoslav authorities, who liberated the city from German occupation on 3 May 1945, objected to these plans, and with the Paris Peace Treaty of 1947, Rijeka and Istria officially became part of Croatia within Yugoslavia.
Split into simpler sentences: The communist Yugoslav authorities, who liberated the city from German occupation on 3 May 1945, objected to these plans. With the Paris Peace Treaty of 1947, Rijeka and Istria officially became part of Croatia within Yugoslavia.