Task: Text Simplification
Input (English): Hero of Alexandria ( ; Greek : , " Heron ho Alexandreus " ; also known as Heron of Alexandria ; c . 10 AD – c . 70 AD ) was a mathematician and engineer who was active in his native city of Alexandria , Roman Egypt .
Output (English): Hero ( or Heron ) of Alexandria ( c . 10 – 70 CE ) was an ancient Greek mathematician and engineer .