Complex sentence: Bowie had insisted on the cropped black-and-white image as he felt that in the original coloured full-size image the sky looked artificial; when Rykodisc reissued Bowie's catalogue in the early 1990s the colour version was used.
Split into simpler sentences: Bowie had insisted on the cropped black-and-white image as he felt that in the original coloured full-size image the sky looked artificial. When Rykodisc reissued Bowie's catalogue in the early 1990s the colour version was used.