Complex sentence: Excavations and research and have discovered petrified diatoms, which help us understand the Palaeo-climate and climate changes, while radiocarbon data evidences human presence dating back 50,000 years.
Split into simpler sentences: Excavations and research and have discovered petrified diatoms, which have contributed to understanding the Palaeo-climate and climate changes. Radiocarbon data evidences human presence dating back 50,000 years.