Complex sentence: Jerusalem was divided in half, into East and West Jerusalem and the village of Barta'a, which, partially due to errors on the map, was left with one third of its area on the Israeli side and two thirds outside of it.
Split into simpler sentences: Jerusalem was divided in half, into East and West Jerusalem. The village of Barta'a, partially due to errors on the map, was left with one third of its area on the Israeli side and two thirds outside of it.