Complex sentence: Their only daughter, Elizabeth Leslie died in 1977 at the age of ninety, her husband, Bay Ares merchant Leon Lazare Roos, passed away in 1956 around the age of seventy-nine.
Split into simpler sentences: Their only daughter, Elizabeth Leslie died in 1977 at the age of ninety. Her husband, Bay Ares merchant Leon Lazare Roos, passed away in 1956 around the age of seventy-nine.