Complex sentence: The composition of the Council remained unchanged through another 3 elections (1991,1995,1998) except that Prof Tsai Shih Tung died in 1996 and was replaced by Prof Li Yin-an (P R China).
Split into simpler sentences: The composition of the Council remained unchanged through another 3 elections (1991,1995,1998). When Prof Tsai Shih Tung died in 1996 he was replaced by Prof Li Yin-an (China).