Complex sentence: Le Bel wrote his chronicle for Jean, lord of Beaumont; and Jean's grandson, Guy II, Count of Blois, continued the tradition by being patron of Book II of Froissart's "Chronicles".
Split into simpler sentences: Le Bel wrote his chronicle for Jean, lord of Beaumont; and Jean's grandson, Guy II, Count of Blois. He later became the patron of Book II of Froissart's "Chronicles".