Complex sentence: A decorator and illuminator, Iollan was responsible for some of the most lavish and carefully planned books, one of which -'History of the Children of Israel'-he boasted of writing in two summer days.
Split into simpler sentences: A decorator and illuminator, Iollan was responsible for some of the most lavish and carefully planned books. One of which -'History of the Children of Israel'-he boasted of writing in two summer days.