@HelloOutThere If you do successfully split the sit into 4 separate sitters you would have to write your review of the first and second sitter before you return home . Which is not ideal .
Better to post the whole sit and if someone can’t do a week at beginning or end you could maybe consider adjusting the dates and creating a second listing for those dates if necessary and the first sitter is happy to take over / handover to another sitter.
These previous threads about spilt sits may give you further insight into a sitter’s perspective.
https://forum.trustedhousesitters.com/t/splitting-a-sit-to-find-someone