Complex sentence: These concerts featured specially-commissioned orchestral and choral arrangements of material spanning all 4 albums, the band themselves playing with the Hallé musicians and Garvey singing positioned just to the right of conductor and arranger Joe Duddell.
Split into simpler sentences: These concerts featured specially-commissioned orchestral and choral arrangements of material spanning all 4 albums. The Hallé musicians and Garvey singers were positioned just to the right of conductor and arranger Joe Duddell.