Complex sentence: The Novoland Duan Dynasty/Empire has been in existence for more than 200 years after it was establish from a Barbarian invasion, they adopted the culture of Zhongzhou and despite its outward appearance of power and prosperity, it is showings signs of decay.
Split into simpler sentences: The Novoland Duan Dynasty/Empire has been in existence for more than 200 years after it was established from a Barbarian invasion. The people adopted the culture of Zhongzhou and despite its outward appearance of power and prosperity, it is showing signs of decay.