Complex sentence: With the surrender of Italy in World War II, the Rijeka issue became topical again and in 1944 a group of citizens issued the "Liburnia Memorandum" Liburnia was the designation of the region in Antiquity.
Split into simpler sentences: With the surrender of Italy in World War II, the Rijeka issue resurfaced. In 1944, a group of citizens issued the "Liburnia Memorandum" Liburnia was the designation of the region in Antiquity.