people work for money to buy things that other people make or do,things that they cannot or will not make or do for themselves but that they deem necessary for some definitions of self-improvement.
People work for money to buy things that {other people make or do things (that they cannot or will not make or do for themselves) but (that they deem necessary for some definitions of self-improvement)}. 你按照上面断开的方式翻译,就能知道大致的意思如下: 人们挣钱用来买东西。这些东西是其他人制造的,而对于制造这来说,这些东西他们不能或不想用来为自己服务,但是他们认为这些东西对于自我改善是必要的。