Complex sentence: Geshem the Arabian (or Geshem the Arab) the only Arab mentioned in the bible, and an ally of Sanballat and Tobiah and adversary of Nehemiah (Neh. ii.19, vi.1).
Split into simpler sentences: Geshem the Arabian (or Geshem the Arab) is the only Arab mentioned in the bible. He was an ally of Sanballat and Tobiah and adversary of Nehemiah (Neh. ii.19, vi.1).