Complex sentence: It was surgically removed in the Hobart Royal hospital on 14 July, taking away much of his ability to read and write, but he has since regained most of his former abilities.
Split into simpler sentences: It was surgically removed in the Hobart Royal hospital on 14 July, taking away much of his ability to read and write. This was to proved to be not the case as he has since regained most of his former abilities.