original: It is the heart of all commercial activities in the country.
simplifications: It is the center of all profit in the country It is in the center of all commercial activities in the country. It's the heart of activities in the country. It is the center of all business activities in the country. It is the heart of commerce in the country. It is the basis for all retail sales in the country. It is the heart of business in the country. It is the middle of all commercial activities in the country. It is the basis of all business actions in the country. It is the core of all of the country's commercial  pursuit