Complex sentence: On analysis of the rock matrix, large amounts of volcanic ash were found, hinting at eruptions during that period, the ash raining onto the marsh, creating viscous mud and becoming subsequent death traps.
Split into simpler sentences: On analysis of the rock matrix, large amounts of volcanic ash were revealed, hinting at eruptions during that period. Large volumes of ash are thought to have fallen into the marsh, creating viscous mud and becoming subsequent death traps.