Complex sentence: In 1939, he moved to New York, to be with his second wife, where he worked for the U.S. Socialist Workers Party and wrote a number of articles for the American Trotskyite and other radical presses.
Split into simpler sentences: In 1939, he moved to New York to be with his second wife. In New York, he worked for the U.S. Socialist Workers Party and wrote a number of articles for the American Trotskyite and radical presses.