Complex sentence: A kettle lake formed by retreating glaciers, it is owned by the Town of Islip under the terms of the Nichols Patent, the land around it is controlled by three town governments-Smithtown, Islip and Brookhaven.
Split into simpler sentences: A kettle lake formed by retreating glaciers, it is owned by the Town of Islip under the terms of the Nichols Patent. The land around it is controlled by three town governments-Smithtown, Islip and Brookhaven.