Complex sentence: He was a member of Hong Kong Executive Council and chairman of the powerful Heung Yee Kuk, which represents the interests of the New Territories establishment, and chairman of Tuen Mun District Council.
Split into simpler sentences: He was a member of Hong Kong Executive Council. He is chairman of the powerful Heung Yee Kuk, which represents the interests of the New Territories establishment, and chairman of Tuen Mun District Council.