Complex sentence: In the meantime many things had changed in Ernest Hemingway's life, he was not in love with Sister von Kurowsky any longer and had even divorced Hadley by the time his novel was published.
Split into simpler sentences: In the meantime, many things had changed in Ernest Hemingway's life. He was in love with Sister von Kurowsky no longer and had divorced Hadley by the time his novel was published.