Complex sentence: The Pilbeam rebuild was completed in the early hours before the Irish Festival Of Speed held in Adare Manor in Limerick where Paul O'Connell having not driven the car since the Donegal crash a year previous managed to finish 3rd overall.
Split into simpler sentences: The Pilbeam rebuild was completed immediately before the Irish Festival Of Speed held in Adare Manor in Limerick. He had not driven the car since the Donegal crash a year previous but still managed to finish 3rd overall.