Complex sentence: Yip's eldest son Ip Chun appears in the film and served as a consultant on the production, which focuses on Yip's life during the 1930s to the 1940s during the Second Sino-Japanese War.
Split into simpler sentences: Yip's eldest son Ip Chun appears in the film and served as a consultant for the film. The film focuses on Yip's life during the 1930s to the 1940s during the Second Sino-Japanese War.