Complex sentence: He confirmed that his child had died of unknown causes at about one-year-old, and added that Grace Sowerbutts had been discovered lying as if dead in his father's barn on about 15 April, and did not recover until the following day.
Split into simpler sentences: He confirmed that his child had died of unknown causes at about one-year-old. He added that Grace Sowerbutts was discovered lying as if dead in his father's barn on about 15 April, and did not recover until the following day.