Complex sentence: In his preface, Verlaine explained that the title was proposed by Rimbaud as a sub-title inspired by the English word "illuminations", in the sense of coloured plates, and dated the composition of the work between 1873 and 1875.
Split into simpler sentences: In his preface, Verlaine explained that the title was based on the English word "illuminations", in the sense of coloured plates, and a sub-title that Rimbaud had already given the work. Verlaine dated the composition of the work between 1873 and 1875.