Complex sentence: The Malacca River or Melaka River which flows through the middle of Malacca Town in the Malaysian state of Malacca, was a vital trade route during the heyday of Malacca Sultanate in the 15th century.
Split into simpler sentences: The Malacca River or Melaka River is a river which flows through the middle of Malacca Town in the Malaysian state of Malacca. It was once an important trade route during the heyday of Malacca Sultanate in the 15th century.