Complex sentence: Léman refused and an hour later, German troops attacked the east bank forts of Chaudfontaine, Fléron, Évegnée, Barchon and Pontisse; an attack on the Meuse, below the junction with the Vesdre, failed.
Split into simpler sentences: Léman refused and an attack began on the east bank forts of Chaudfontaine, Fléron, Évegnée, Barchon and Pontisse, an hour later. An attack on the Meuse, below the junction with the Vesdre, failed.