Simplify the following text for a Grade 11 native English-speaking person.
Original: The Fujita scale ( F-Scale ) , or Fujita-Pearson scale , is a scale for rating tornado intensity , based on the damage tornadoes inflict on human-built structures and vegetation .
Simplified: The Fujita scale , is a scale used for rating tornado strength , based on the damage tornadoes cause on human-built buildings and vegetation .