Complex sentence: There was a rumour in the 1970s, that some Americans wanted to buy the fossil site The Quebed government at this, purchased a large tract of the land to preserve the fossils and important paleotological value of the area, and it was declared a Provincial Park.
Split into simpler sentences: There was a rumour in the 1970s, that some Americans wanted to buy the fossil site. The Quebec government at this, purchased a large tract of the land to preserve the fossils and important paleotological value of the area, and it was declared a Provincial Park.