Due to word et al not pasting correctly, the remainder of my comments aren't as useful. I had to copy to a word doc since the space limit was exceeded. If you want the doc with my edits, message me to let me know. I can email it to you or otherwise post it somewhere on the internet. I'm only going to post my rewritings since the edits don't really make sense without coloring.

I was angry with the issue, so I called the supervisor of the warehouse department and told him that I never want to see them working in our department again, and to fire them all NOW. I told him to go through the resignation procedure with them all. The supervisor replied that I couldn't fire them together because there were only four employees working the night shift of the material warehouse. If I fired them together, the warehouse might not have enough workers. I told him to fire all of them immediately. Four employees might be a lot for the material warehouse, which only has 15 employees, but we have more than 60 employees in our whole warehouse department, so we can make up for the loss. Firing them will let the other employees know that they should have a sense of responsibility. If you don't, you should leave my team or I will make you leave my team.

Maybe you think I am too strict, that I am too unfeeling. I don't think so. I am not. In my opinion, I could accept an employee who doesn't have enough experience or managing skill, the sense of responsibility is most important. I really hate people who just spend time here earning their salary. It's not just wasting the the company's money, it's also wasting their life. Life is too short to let us waste it.

Overall, the structure is good. Make sure you get the punctuation position right. It is very distracting to read otherwise for native speakers. period(.), comma(,), semicolon(;) and colon(:) are all placed immediately after a word followed by a space.

There are a few places where you reverse word order, probably consistent with the Chinese phrasing. I tried to keep the green sections as close to yours as possible except when the phrasing made things awkward to read or when the meaning was ambiguous.

Cheers