Complex sentence: From 1308 to 1311 and again from 1458 the landgraviate was divided in Upper Hesse and Lower Hesse until its re-unification under Landgrave William II in 1500.
Split into simpler sentences: From 1308 to 1311, and again from 1458, the landgraviate was divided into Upper Hesse and Lower Hesse. Hesse was re-unified under Landgrave William II in 1500.