Complex sentence: The floor of the lake is a limestone basin, and the lake varies in depth from 1 to 13 feet (0.3 to 4 m), its water being somewhat murky from nutrient-enriched runoff from surrounding farmlands.
Split into simpler sentences: The floor of the lake is a limestone basin, and the lake varies in depth from 1 to 13 feet (0.3 to 4 m). Its water is somewhat murky from nutrient-enriched runoff from surrounding farmlands.