Complex sentence: All over the country, but especially in northern Israel (Galilee, Upper Galilee and Golan Heights) the zimers has developed an extensiveto private families and rural settlements are rented for a short period.
Split into simpler sentences: All over the country, but especially in northern Israel (Galilee, Upper Galilee and Golan Heights) the zimers has developed an extensive industry. Settlements belonging to private families and rural settlements are rented for a short period.