<span>Their structure, can separate groups of people. This makes it difficult for people, goods, and ideas to move from one place to another. This would also affect the climate.</span>
Maybe you should state the birth dates... what he had done to achieve his name and reputation and finally how as he improved the world.. maybe Alis state is it still used after he has left... remember summarizing is not recreating the whole passage in your words.. its just taking down the main points. You won't even need to do any changes to them.
