Complex sentence: The Mariana Trench or Marianas Trench Variant according to the U.S. National Geospatial-Intelligence Agency is the deepest part of the world's oceans is located in the western Pacific Ocean, to the east of the Mariana Islands.
Split into simpler sentences: The Mariana Trench or Marianas Trench Variant according to the U.S. National Geospatial-Intelligence Agency is the deepest part of the world's oceans. It is located in the western Pacific Ocean, to the east of the Mariana Islands.