Complex sentence: The first Kenton mellophonium band was a far more symphonic sounding group than earlier versions of the Kenton orchestra; these initial September 1960 sessions function to work through the orchestration and sonic problems with such a wide variety and number of instruments being recorded live in the studio.
Split into simpler sentences: The first Kenton mellophonium band was a far more symphonic sounding group than earlier versions or periods of the Kenton orchestra. The initial September 1960 sessions function to work through the orchestration and sonic problems presented by such a wide variety and number of instruments being recorded live in the studio.