Complex sentence: Immediately afterwards the "late monastery of Moghill" was divided between and, before Mohill was secured by an englishman named John Crofton, who later bequeathed it to his son Henry by deed dated.
Split into simpler sentences: Immediately afterwards the "late monastery of Moghill" was divided between and. Barret's parcel of Mohill passed to an englishman named John Crofton, who bequeathed it to his son Henry by deed dated.