In some circumstances, leaders are created by the demands that are placed on them just like what the issue puts, like the leaders in governments and schools. However, there are others causes that equally defines what is a leader; take corporations as an example and so on.
仅仅看你的主旨句就出现了自相矛盾的情况
要避免这种情况你需要具体指出在什么情况下leaders are created by the demands that are placed on them
然后这个主题句What's more, for the preservation and continuation of our system of knowledge, schools are created.
leader去哪儿了 主题句都偏题了 这段不就废了么