Complex sentence: Over time, however, Gellhorn becomes more prominent in her own right, leading to certain career jealousies between the two, and in 1945 Gellhorn became the only one of Hemingway's four wives to ask him for a divorce.
Split into simpler sentences: Over time, however, Gellhorn becomes more prominent in her own right, leading to certain career jealousies between the two. Lastly, in 1945, Gellhorn became the only one of Hemingway's four wives to ask him for a divorce.