Complex sentence: After a brief stay he moved to Spain, where he stayed until Italy surrendered to Allied forces in July 1943, which made him to return immediately to Rome to see to the safety of his only child, the daughter Maria (born ca.1921).
Split into simpler sentences: After a brief stay he moved to Spain, where he stayed until Italy surrendered to Allied forces in July 1943. He returned immediately to Rome to see to the safety of his only child, the daughter Maria (born ca.1921).