Complex sentence: Its authorship, long obscured by abstruse claims and speculation, has ultimately been attributed to Isaac Baulot, an apothecary and savant of matters medicinal at La Rochelle, born there in 1612.
Split into simpler sentences: Its authorship, long obscured by abstruse claims and speculation, has been established. He was Isaac Baulot, an apothecary and savant of matters medicinal at La Rochelle, born there in 1612.