General grammar in report writing

This is sentences i made for my report writing ,please correct my sentences if i am wrong

Diamond Restaurant is undergoing decline in business and a group was assigned to conduct a survey to find out the reason. Research shows that the company have received complaints from customer about the areas of unsatisfactory service. As the Head of the Marketing Department of Relax Resort & Spa, I intend to explain the causes for the area of unsatisfactory service & propose ways to solve the problems / to recover the business

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