Complex sentence: On June 1,2014, his wife, Ann Shulgin, reported on Facebook that Shulgin's health has become critical and he had developed liver cancer, but he was experiencing his last moments in peace and without pain.
Split into simpler sentences: On June 1,2014, his wife, Ann Shulgin, reported on Facebook that Shulgin developed liver cancer and his health has become critical. Even though appearing frail, he was said to be experiencing his last moments in peace and without pain.