Complex sentence: The English of Meath pillage the lands of Lord of Annaly GiUa O’Farrell (the Just), causing him to take revenge by slaying many and destroying land in County Meath.
Split into simpler sentences: The English of Meath pillage the lands of Lord of Annaly GiUa O’Farrell (the Just). This caused Lord Annaly GiUa O’Farrell to take revenge by slaying many and destroying land in County Meath.