Complex sentence: Fossil hunters in southwestern China uncover the remains of a huge marine ecosystem; dating back 252 million years, the site is filled with over 20,000 fossils including plants, carnivorous fish and large reptiles.
Split into simpler sentences: Fossil hunters in southwestern China uncover the remains of a huge marine ecosystem. Dating back 252 million years, the site is filled with over 20,000 fossils including plants, carnivorous fish and large reptiles.