Complex sentence: The author Willem Vrelant Ultrech born in 1410 and died in Bruges in 1481, was a student of Jan van Eyck, and was active in Flanders, where the book of hours was made between 1465 and 1470.
Split into simpler sentences: The author Willem Vrelant of Ultrech was born in 1410 and died in Bruges in 1481. He was a student of Jan van Eyck, and was active in Flanders, where the book of hours was made between 1465 and 1470.