Complex sentence: When he ascended the throne, he took keen interest in the administration of justice, introduced reforms, and reorganised the military department, but gradually sank into a life of pleasures surrounded by courtesans, singers, dancers, and eunuchs.
Split into simpler sentences: When he ascended the throne, he took keen interest in the administration of justice, introduced reforms, and reorganised the military department. But gradually, he sank into a life of pleasures surrounded by courtesans, singers, dancers, and eunuchs.