Complex sentence: Johnson's transition from practicing artist to professional is largely undocumented, though some say he left from Boston to Chicago to live with some relatives and afterwards, in 1915, Sargent Johnson moved to the San Francisco Bay area.
Split into simpler sentences: Johnson's transition from practicing artist to professional is largely undocumented, though some say he left from Boston to Chicago to live with some relatives. In 1915 Sargent Johnson moved to the San Francisco Bay area.