Complex sentence: About 30 years later detailed stratigraphic analysis of the area surrounding the fossil argon dated layers MemberI to 195 kya and MemberIII to 105 kya.
Split into simpler sentences: About 30 years later detailed stratigraphic analysis of the area surrounding the fossils was carried out. This argon dated the Member I layer to 195 kya and that of Member III to 105 kya.