Complex sentence: Tenasserim Hills or Tenasserim Range (,;,) is the geographical name of a mountain chain forming a natural border between Burma and Thailand and extending to the Kra Isthmus into the Malay peninsula.
Split into simpler sentences: Tenasserim Hills or Tenasserim Range (,;,) is the geographical name of a mountain chain in Southeast Asia. This range forms a natural border between Burma and Thailand, extending to the Kra Isthmus into the Malay peninsula.