Here's a revised version for you to consider. Some of it needed re-writing but I have kept it to the minimum. Hope it helps. :)
I will talk about a great person in the kingdom of Saudi Arabia. His name is Prince Sultan. When he died he left behind several deeds of charity to a lot of people inside and outside the kingdom. For example within the kingdom he is considered the first one to establish the Saudi military. He also donated [money? – what did he donate?] to many countries and through his remarkable achievements entered history as a great man.