Complex sentence: Strong atheism or Gnostic atheism is a term popularly used to describe atheists who accept as true the proposition "gods do not exist", while weak atheism refers to any other type of non-theism.
Split into simpler sentences: Strong atheism or Gnostic atheism is a term generally used to describe atheists who accept as true the proposition "gods do not exist". Weak atheism refers to any other type of non-theism.