Complex sentence: St.Scuithin later returned to Ireland to live as an eremitic Christian Monk, building himself an isolated cell in the Johnswell hills in the ancient barony of Slieve Margy.
Split into simpler sentences: St.Scuithin later returned to Ireland to live the life of a Christian hermit monk by building himself an austere and isolated cell. This cell was located in the Johnswell hills in the ancient barony of Slieve Margy.