Complex sentence: Much of the current layout and proportions of the structure date from the first Norman abbot, Paul of Caen (1077--1093), the 14th abbot, he was appointed by the new Archbishop of Canterbury, Lanfranc.
Split into simpler sentences: Much of the current layout and proportions of the structure date from the first Norman abbot, Paul of Caen (1077--1093). The 14th abbot, he was appointed by the new Archbishop of Canterbury, Lanfranc.