Complex sentence: His firm, Roger Graham Music Publisher, published the "Livery Stable Blues"--recorded in 1917 by the Original Dixieland Jass Band and widely acknowledged as the first commercially recorded jazz.
Split into simpler sentences: His firm, Roger Graham Music Publisher, published the "Livery Stable Blues"--recorded in 1917 by the Original Dixieland Jass Band. It is widely acknowledged as the first commercially recorded jazz.