麻烦帮我看下这个句子有没有错误

问题描述:

麻烦帮我看下这个句子有没有错误
the salary they can earn in Australia is higher than the salary they can earn New Zealand.
能不能简化一下

主要是有两个 the salary they can earn ,重复了,第二个可以用代词替代
改成the salary they can earn in Australia is higher than that in New Zealand.