Simplify the following text for a Grade 11 native English-speaking person.
Original: Mixtures of potassium chlorate and a fuel can be ignited by contact with sulfuric acid and this reagent should be kept away from potassium chlorate . Sulfur should be avoided in pyrotechnic compositions containing potassium chlorate , as these mixtures are prone to spontaneous deflagration .
Simplified: Many other chemicals can make dangerous mixtures with potassium chlorate .