Complex sentence: The younger debris avalanche deposit has a volume of about, it was believed that it occurred about 600,000-400,000 years ago, but dating of the andesites cut by the collapse yielded a maximum age of 292,000 ± 25,000 years ago.
Split into simpler sentences: The younger debris avalanche deposit has a volume of about. It was believed that it occurred about 600,000-400,000 years ago, but dating of the andesites cut by the collapse yielded a maximum age of 292,000 ± 25,000 years ago.