Simplify the following text for a Grade 11 native English-speaking person.
Original: Instead of a short nuclear exchange , the Kaled-Thal war was portrayed as a thousand-year-long war of attrition , fought with nuclear , biological and chemical weapons causing widespread mutations among the Kaled race .
Simplified: Instead of a short nuclear exchange , the Kaled-Thal war was portrayed as a thousand-year-long war , fought with nuclear and other weapons causing widespread mutations among the Kaled race .