Complex sentence: Helen Gallagher (died 1943) was a Ziegfeld girl and restaurateur who co-founded Gallagher's Steak House was the wife of Ed Gallagher (1873-1929).
Split into simpler sentences: Helen Gallagher (died 1943) was a Ziegfeld girl and restaurateur who co-founded Gallagher's Steak House. She was the wife of Ed Gallagher (1873-1929).