Complex sentence: Born in Celbridge, County Kildare, Mackey first arrived on the inter-county scene when he first linked up with the Kildare minor team, before later lining out with the under-21 side.
Split into simpler sentences: Born in Celbridge, County Kildare, Mackey first played competitive hurling in his youth. He arrived on the inter-county scene when he first linked up with the Kildare minor team, before later lining out with the under-21 side.