Complex sentence: In 1915, Harper first came to New York City, but quickly moved to Chicago and began choreographing and performing dance acts with Osceola Blanks of the Blanks Sisters, whom he married in 1923.
Split into simpler sentences: In 1915, Harper first toured in New York City, but quickly moved to Chicago. There he began choreographing and performing dance acts with Osceola Blanks of the Blanks Sisters, whom he married in 1923.