Complex sentence: In 1579, Nobunaga captured Yakami Castle from Hatano Hideharu by promising Hideharu peace terms, but Nobunaga betrayed the peace agreement and had Hideharu executed.
Split into simpler sentences: In 1579, Nobunaga captured Yakami Castle from Hatano Hideharu by promising Hideharu peace terms. Although, Nobunaga betrayed the peace agreement and had Hideharu executed.