Complex sentence: A hotel was added to the main house, while the estate's eighteenth century grounds were converted into two golf courses, one designed by Mark O'Meara and the other by Colin Montgomerie.
Split into simpler sentences: A hotel was added to the main house, while the estate's eighteenth century grounds were converted into two golf courses. Carton House Golf Club has two courses, one designed by Mark O'Meara and the other by Colin Montgomerie.