While multinational companies provide employment opportunities, but they often cause local businesses to go bankrupt.
Contrast sentences mistakes. "While" and "but" can't be used together; TWO linkers CAN NOT join only TWO clauses. Remove the "but".
One of the reason for the popularity of the cinema is that watching films on the big screen are more exciting.
Subject / Verb Agreement mistake. With “one”, use a PLURAL noun after “of the” (reasons). With a clause with a gerund, use a SINGULAR verb (is).
Not only advertising affects people’s spending habits, but it also has an impact on the types of products we desire.
Inversion mistake. Not only DOES advertising AFFECT people’s spending habits, it also has an impact on the types of products we desire.