Complex sentence: Kitty came up with a solution so obvious that it had occurred to no one else: remodel the little temporary cottages, move them from the camps to the outlaying districts and encourage families to buy them on long-term payments.
Split into simpler sentences: Kitty came up with a solution so obvious that it had occurred to no one else. Why not remodel the little temporary cottages, move them from the camps to the outlaying districts and encourage families to buy them on long-term payments.