Complex sentence: He was resident in Rome during the years 1700 and 1701: the year of his death is uncertain, but his will, dated 1715, is said to be preserved in the archives of the English College, Rome.
Split into simpler sentences: He was resident in Rome during the years 1700 and 1701. The year of his death is uncertain, but his will, dated 1715, is said to be preserved in the archives of the English College, Rome.