Complex sentence: Due to its relatively dry environment and the shape of the cave, Ngalue had very good preservation and not only were stone tools and animal bones found, but there was preserved starch grains on many of the stone tools as well.
Split into simpler sentences: Due to its relatively dry environment and the shape of the cave, Ngalue had very good preservation and not only were stone tools and animal bones found. There were preserved starch grains on many of the stone tools as well.