Complex sentence: Christopher St Lawrence, 2nd Baron Howth (died 1462 or 1465) was an Anglo-Irish nobleman, a key figure in fifteenth-century Irish politics, and one of the strongest supporters in Ireland of the House of York.
Split into simpler sentences: Christopher St Lawrence, 2nd Baron Howth (died 1462 or 1465) was an Anglo-Irish nobleman. He was a key figure in fifteenth-century Irish politics, and one of the strongest supporters in Ireland of the House of York.