Complex sentence: Communiqués had been issued about foreseeable troubles between Arabs and Jews (by an administration which had to impose unpopular policies on the Arabs); to Weizmann these were reminiscent of instructions that Russian generals had issued on the eve of pogroms.
Split into simpler sentences: Communiqués had been issued about foreseeable troubles between Arabs and Jews. To Weizmann these were reminiscent of instructions that Russian generals had issued on the eve of pogroms.