Social responsibility is never simply a slogan, or a propaganda to promote more sales for a corporate companyion. Social responsibility is never simply a slogan to promote more sales for a corporation.

"Corporate" means "company," so "corporate company" is redundant. Propaganda is uncountable, and it's not quite the right word here. It always refers to a political agenda, so governments and political parties produce propaganda, but companies generally don't. Propaganda also has a distinctly negative connotation, more so than just your average corporate advertising.

To some extent, it might give some burden to the corporate company and even slow down the work efficiency, but theits advantages of it far outweighs its disadvantages. To some extent, it might give some burden to the corporate company and even slow down the work efficiency, but its advantages far outweigh its disadvantages.

Unclear what "it" refers to here.

One significant advantage is that it promotes a high- quality of life for customers. One significant advantage is that it promotes a high quality of life for customers.

Only add a hyphen when "high quality" functions as an adjective. E.g., "this company sells high-quality products." But don't add a hyphen when "quality" functions as a noun. E.g., "the company prides itself on the high quality of its products."

They could certainly utilize dirt -cheap fossil fuel for the buses, but the hazardous chemicals emitted from buses would harm pedestrians' health. They could certainly utilize dirt-cheap fossil fuel for the buses, but the hazardous chemicals emitted from buses would harm pedestrians' health.

"Dirt-cheap" is functioning as an adjective here, hence the hyphen.

What's worse is that it pollutes the environment, and worst of all it deteriorates its brand and goodwill. What's worse is that it pollutes the environment, and worst of all it deteriorates its brand and goodwill.

"Goodwill" isn't quite the right word here. Do you mean that it's ethically dubious for companies to use fossil fuels?

The business benefit is not solely enjoyed by the company itself, but also by the public in general. The business benefit is not solely enjoyed by the company itself, but also by the public in general.