Complex sentence: In 1609 Burby's widow assigned his copyrights, mainly of theological works, to the publisher's former apprentice Nicholas Bourne, who printed no dramatic works in his career but was a successful publisher of news who worked for many years in partnership with Nathaniel Butter.
Split into simpler sentences: In 1609 Burby's widow assigned his copyrights--mainly of theological works--to the publisher's former apprentice Nicholas Bourne. Bourn had printed no dramatic works in his career, but was a successful publisher of news who worked for many years in partnership with Nathaniel Butter.