这句话你这么看,就明白了
as A has ...,so has B
随着 A 有,B 也有了
原句后段的意思是 ,therefore,Australia's share of the Japanese tourists market has also grown
(so has 这里 = has also grown)
as his father has more money to spend because of a better paid job,so has Tom
因为Tom 的爸爸有了比较好的工作,有多余的钱可花,Tom也有了多余的钱可花了