Original sentence: Laboratory experiments can produce effects that are visually similar to reports of ball lightning, but how these relate to the supposed phenomenon remains unclear.Owing to inconsistencies and to the lack of reliable data, the existence of ball lightning remains unproven.Reports of ball lightning phenomena appear in a variety of accounts over the centuries, but most scientists have treated reports of ball lightning skeptically, despite numerous accounts from around the world.Scientific data on natural ball-lightning remain scarce.Scientists have proposed many hypotheses regarding reports of ball lightning over the centuries.Though usually associated with thunderstorms, the phenomenon is said to last considerably longer than the split-second flash of a lightning bolt.Two reports from the nineteenth century said that the ball eventually explodes, leaving behind an odor of sulfur
Edited sentence: Laboratory experiments can produce effects that are visually similar to reports of ball lightning, but how these relate to the natural phenomenon remains unclear.Owing to inconsistencies and to the lack of reliable data, the true nature of ball lightning remains unknown.Scientific data on natural ball-lightning remain scarce, owing to its infrequency and unpredictability.Scientists have proposed many hypotheses about ball lightning over the centuries.The ball lightning phenomena appear in a variety of accounts over the centuries, but until the 1960s, most scientists treated reports of ball lightning skeptically, despite numerous accounts from around the world.Though usually associated with thunderstorms, the phenomenon lasts considerably longer than the split-second flash of a lightning bolt.Two reports from the nineteenth century say that the ball eventually explodes, leaving behind an odor of sulfur