Complex sentence: The Right Honourable Richard Wesley, 1st Baron Mornington spent vasts amounts of money on the gardens of 600 Irish acres with a lake covering 26 acres with a fort, several islands, and several ships.
Split into simpler sentences: The Right Honourable Richard Wesley, 1st Baron Mornington spent a considerable sum of money improving and maintaining the gardens of 600 Irish acres. These included a lake covering 26 acres, with a fort, several islands, and several ships.