Complex sentence: The Aarmassif or Aaremassif (German: "Aarmassiv") is a geologic massif in the Swiss Alps, that contains a number of large mountain chains and parts of mountain chains.
Split into simpler sentences: The Aarmassif or Aaremassif (German: "Aarmassiv") is a geologic massif in the Swiss Alps. It contains a number of large mountain chains and parts of mountain chains.