Complex sentence: The study, funded by Japan's ministry of health, is the largest of its kind ever carried out, and over the years the scientists involved have had access to more than 600 Okinawan centenarians.
Split into simpler sentences: The study, funded by Japan's ministry of health, is the largest of its kind ever carried out. Over the years, the scientists involved have had access to more than 600 Okinawan centenarians.