There are, nevertheless, many people working hard, forgetting their health.

However, there are many people out there working themselves down to the bone and neglecting their health/well-being.

Money is really the best invention along with human activities.

*I don't quite understand this sentence.

It makes people happy, while also driving some of us crazy and die for it.

It makes some people happy, and drives some people crazy; some even die for it.

People often say that money is not everything and that health is the most important.

There are, nevertheless, many people working hard, forgetting about their health.

"neglecting" would be a more formal replacement for "forgetting about"

We cannot blame them; they must have their own reasons why this is case.

Or "reasoning" to replace "reasons"

Money is really the best invention along with human activities.

"best" is fine but "greatest" would sound better

It makes some people happy, while also driving some of us crazy andother crazy enough to die for it.

People often say that money is not everything and that health is the most important.

There are, nNevertheless, there are many people working hard, forgetting to take care of their health.

Money is really the best invention along with human activities.

Activities is a bit vague, do you mean inventions or contributions?

It makes people happy, while also driving some of us crazy andenough to die for it.

People often say that money is not everything and, health is the mostwhat's important.

There are, nevertheless, many people working hard, forgetting at the expense of their health.

It's possible that these hard working people forget about their health, but it's not a common phrasing and one who is cognizant of their health might still choose to work hard out of necessity.

Money is really the best invention along with(for?) human activities.

This line feels incongruent with the previous. To say that we can't blame people for forsaking their health is to claim that health is really important, but then to say that money is the best invention suggests health really isn't all that important, money is everything.

I'm wondering if you meant something along the lines of the classic libertarian argument that money is the best *motivator* for human activities.

It makes some people happy, while also driving some of us crazy andothers crazy. Some will even die for it.

I'm not sure if I really understood this line. This sentence pattern isn't unusually used this way which makes the meaning a bit unclear. Consider the below:

Cars have tires, but some cars have flat tires. (The pattern is "all of A is x, but some of A is x+y")
Some people like strawberry ice-cream the most while others prefer chocolate. (The pattern is "some of A is x while other of A is y")

So whether you intend to say that some people are driven happily crazy by money or that the happy money-havers are a separate group from the crazy money-havers is unclear.