Complex sentence: In 1977 he started his own music publishing and personal management company working with recording artists/songwriters Kim Carnes, Jules Shear (Jules and the Polar Bears) and the group Slow Children.
Split into simpler sentences: In 1977 he started his own music publishing and personal management company. Here he worked to promote recording artists/songwriters Kim Carnes, Jules Shear (Jules and the Polar Bears) and the group Slow Children.