Complex sentence: First taking sanctuary in a convent in the Old City for two years, he went on to become the director of the Augusta Victoria Hospital on the Mount of Olives, where he lived with his family through his retirement until his death in 1964.
Split into simpler sentences: First taking sanctuary in a convent in the Old City for two years, he went on to become the director of the Augusta Victoria Hospital on the Mount of Olives. He lived with his family there through his retirement until his death in 1964.