Complex sentence: Her interactive work takes the form of a hollow haystack, referencing the conical stacks made of rice'hay' in the fields around Hue that were used for cooking fires, not animal feed.
Split into simpler sentences: Her interactive work takes the form of a hollow haystack, referencing the conical stacks made of rice'hay' in the fields around Hue. The haystacks were used for cooking fires, not animal feed.