Complex sentence: The Bazhenov Formation or Bazhenov Shale is a stratum in the West Siberian basin formed from sediment deposited in a deep-water sea in Tithonian--early Berriasian time.
Split into simpler sentences: The Bazhenov Formation or Bazhenov Shale is a stratum in the West Siberian basin. It was formed from sediment deposited in a deep-water sea in Tithonian--early Berriasian time.