Complex sentence: Despite the story's popularity, its accuracy has been disputed because it was first recorded in 1824 by a Philadelphia lawyer as a literary piece in the newspapers; and there is no writing from Hugh Glass himself to corroborate the veracity of it.
Split into simpler sentences: Despite the story's popularity, its accuracy has been disputed. The story was first recorded in 1824 by a Philadelphia lawyer as a literary piece in the newspapers; however, there is no writing from Hugh Glass himself to corroborate the veracity of it.