有错误，用of which中间不能用and,
可以改成：An old acquaintance called him, saying that there was a recruitment of an assistant， of which the wage was high.
你的意思是要表达 一位熟人告诉他，说新来的助理工资很高是不是？是的话那语病有误了，可以这样表达，An acquaintance told him that a recruitment of an assistant who had a high wages.
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