Complex sentence: Overall, the intention was to assimilate the Gaelic and Gaelicised upper classes and develop a loyalty on their part to the new crown; to this end, they were granted English titles and for the first time admitted to the Irish parliament.
Split into simpler sentences: Overall, the intention was to assimilate the Gaelic and Gaelicised upper classes and the develop a loyalty on their part to the new crown. They were granted English titles and for the first time admitted to the Irish parliament.