Complex sentence: In 1678, he declared himself the emperor of a new Zhou Dynasty, with the era name of Zhaowu (昭武), and made his capital at Dongting-Hu (洞庭湖), which was formerly Hengzhou (衡州) and is now Hengyang, Hunan.
Split into simpler sentences: In 1678, he went further and declared himself the emperor of a new Zhou Dynasty, with the era name of Zhaowu (昭武). He made his capital at Dongting-Hu (洞庭湖), which was formerly Hengzhou (衡州) and is now Hengyang, Hunan.