Complex sentence: This phenomenon is often said to be unique to the Negev desert (Israel) and the Sinai Peninsula (Egypt) although similar features exist in Turkmenistan (Yor-oilan-duz depression in Badkhyz Highlands) and Iran.
Split into simpler sentences: This phenomenon is often said to be unique to the Negev desert (Israel) and the Sinai Peninsula (Egypt). However, similar features exist also in Turkmenistan (Yor-oilan-duz depression in Badkhyz Highlands) and Iran.