Complex sentence: Instead it is being developed as a place where families and individuals can relax, learn, and contribute voluntarily to its operation with the aim of giving visitors a better understanding of food and its production, both historically and today.
Split into simpler sentences: Instead it is being developed as a place where families and individuals can relax, learn, and contribute voluntarily to its operation. The overriding theme is a better understanding of food and its production, both historically and today.