Complex sentence: It is called a badlands due to its difficult to traverse topography and the sediment it is from Lake Zabriske which dried-up 9 million years ago-long before Death Valley even existed.
Split into simpler sentences: It is called a badlands due to its difficult to traverse topography. The area is composed of sediment from Lake Zabriske, which dried-up 9 million years ago-long before Death Valley even existed.