Complex sentence: An abdication within the Imperial Family has not occurred since Emperor Kōkaku abdicated in 1817.However the palace has denied those rumors and saying that Akihito doesn't intend to abdicate.
Split into simpler sentences: An abdication within the Imperial Family has not occurred since Emperor Kōkaku abdicated in 1817. However, the palace has denied those rumors, saying that Akihito does not intend to abdicate.