Complex sentence: He was Archdeacon of Dublin before becoming Bishop of Ossory in 1244; he also held a number of administrative posts: most notably he was Treasurer of Ireland 1235-50 and he was also Lord Chancellor of Ireland around 1237.
Split into simpler sentences: He was Archdeacon of Dublin before becoming Bishop of Ossory in 1244. He also held a number of administrative posts: most notably he was Treasurer of Ireland 1235-50 and he was also Lord Chancellor of Ireland around 1237.