Complex sentence: During World War II was on the front, away from home and did not know that he died of Spanish flu beloved wife Gilda, or originating from a patrician family Marulića Mark, the father of Croatian literature.
Split into simpler sentences: During World War II on the front, away from home he did not know that his beloved wife Gilda died of the Spanish flu. Gilda was from a patrician family Marulića Mark, the father of Croatian literature.