Complex sentence: Campbell laid out the high walled garden which is now the nearby caravan park with huge heated glass houses with vines where he grew peaches, pineapples, nectarines and other exotic fruits.
Split into simpler sentences: Campbell laid out the high walled garden which is now the nearby caravan park. The garden had huge heated glasshouses, with vines where he grew peaches, pineapples, nectarines and other exotic fruits.