Complex sentence: The 1965 Indo-Pakistani War was witness to the largest tank battle in military history since World War II. This battle led to the creation of Patton Nagar (or Patton City) at the site of the battle viz., Khemkaran.
Split into simpler sentences: The 1965 Indo-Pakistani War was witness to the largest tank battle in military history between World War II adn 1965. The battle led to the creation of Patton Nagar (or Patton City) at the site of the battle viz., Khemkaran.