You need another background sentence for your intro..
Many countries have considered globalization as a primary solution for economic problems.
Globalization is a series of social, cultural, economical, technological, and political changes that promote interdependence and growth.
this can be used as your second sentence but make it concise don't be obvious on being concious about your word count. Try this
Globalization involves a series of changes which promote interdependence and growth in a nation.Globalization raises the standard of living in developing countries. spreads technological knowledge and increases political liberation
these are good main ideas for your advantages..don't state them in your intro.., you could choose at least two and expand it, use examples.
One of the benefit of globalization is an increased human development index (H.D.I).
this is a strong example not a main idea so it should not be in the first sentence of your paragraph.
Overall, you need to improve your structure, don't overuse words just to meet the minimum word count. Eventually as ideas will flow your sentences will be longer so don't worry too much on that. Your conclusion is aligned to disadvantage only instead of summarizing both. The essay prompt is asking you to discuss the advantages and disadvantages so you don't need to mention which side you are at.
A tip for this kind of essay would be a structure like this:
INTRO: background sentence and theory
BODY PAR: 2 main advanatge ideas with examples
BODY PAR: 2 main disadvanatge ideas with examples
CONC: summarize your point of view on both sides relating to the ideas you mentioned, you are allowed to give some recommendations also but its not necessary