Complex sentence: After the proper temperature is reached the terrine is removed from the oven and placed into a cooling unit topped with a weight to compact the contents of the terrine and then it is allowed to rest for several days to allow the flavors to blend.
Split into simpler sentences: After the proper temperature is reached the terrine is removed from the oven and placed into a cooling unit topped with a weight to compact the contents of the terrine. Then it is allowed to rest for several days to allow the flavors to blend.