Grammar questions.

Hello
Can you help me edit these simple sentences.
I am grateful for your help.


If he doesn't devote himself to his occupation, he will deter his company to expand on its business.

Companies can raise enough funds by issuing stocks.

Some of workers were laid off in the process of combination of different companies

Businesses are vulnerable to the business recession.

What is the purpose of running a business is to earn the great amount of money from the market