Complex sentence: Each of these three lakes in turn have Islands within them, the most impressive and legendary of these being Lake Mindemoya's 82 acre Treasure Island which is located in the centre of Manitoulin.
Split into simpler sentences: Each of these three lakes in turn have Islands within them. The most impressive and legendary of these being Lake Mindemoya's 82 acre Treasure Island which is located in the centre of Manitoulin.