from morning to night 意为：从早到晚
根据前面的harder,后面应该选择 more.
这句话的意思是：他从早到晚更加努力地工作是为了赚更多的钱.
这句话可以改写为：He worked harder from morning to night so that he could make more money.
He worked so harder from morning to night that he could make more money.
(so as to = so that = so ...that...)