Complex sentence: It consists of 121 sheets each measuring around 17 x 12cm, of which 14 contain full page miniatures, each placed opposite the beginning of one of the prayers, and which stylistically can be placed as between 1460 and 1475.
Split into simpler sentences: It consists of 122 pages, each measuring around 17 x 12cm, of which 14 contain full page miniatures. These are placed opposite the beginning of one of the prayers, and based on their style, can be placed between 1460 and 1475.