Complex sentence: A Master Plan for an archeological park was developed for Champaner City and Pavagarh as a cultural sanctuary, and the Archeological Survey of India, supported by the Baroda Heritage Trust, submitted a proposal to UNESCO to declare the site a World Heritage Site.
Split into simpler sentences: A Master Plan for an archeological park was developed for the Champaner City and Pavagarh as a cultural sanctuary. The Archeological Survey of India, supported by the Baroda Heritage Trust, submitted their proposal to UNESCO to declare the Champaner-Pavgarh site as World Heritage Site.