Complex sentence: Ehud Manor and Nurit Hirsch wrote the chosen song, "Ey Sham" in Hebrew, although in that year contest, countries didn't have to sing in their national languages.
Split into simpler sentences: Ehud Manor and Nurit Hirsch wrote the chosen song, "Ey Sham". The song was written in Hebrew, even though that year countries didn't have to sing in their national languages.