> Money can buy many, if not most, if not all, of the things that make people happy, and if it doesn’t, then the fault is ours.
Maybe a parenthetical clause?
> Money can buy many (if not most, if not all) of the things that make people happy, and if it doesn’t, then the fault is ours.
Money can buy most, if not all of the things that make …
?
You are all a bunch of unrepentant nerds :D
> Money can buy most, if not all of the things that make...
> Money can buy most, if not all, of the things that make...
> Money can buy many, if not most, if not all, of the things that make people happy, and if it doesn’t, then the fault is ours.
Maybe a parenthetical clause?
> Money can buy many (if not most, if not all) of the things that make people happy, and if it doesn’t, then the fault is ours.