Does this sentence sound natural? If so, would you amend the parts which might be weak or could have been better typed. (Not "typed". Typing is a matter of striking keys. A better word is "written".)
Our school has employed Mr. Hassan as
a(I assume that there is only one "Headteacher", so "a" cannot be used here. Either do not use an article, or use "the".) Headteacher - I though he was as uptight as the previous one, Mr. Gamal, when I first saw him shout (One does not "see" a shout, one hears a "shout".) at one of the kindergarten students, but he turned out to be a kind, approachable and wise man that(Use "who" when referring to people.) uses his wisdom to solve problems among students, and, much to my surprise, he's stopped Jack from bullying.
Student or Learner