Complex sentence: From the breakers it was estimated to have a least water depth of only 0.6 to 0.9 meters, and appeared to be about 1.6 km long northwest to southeast, and less in width.
Split into simpler sentences: From the breakers it has been estimated to have a least water depth of only 0.6 to 0.9 meters. It is about 1.6 km long northwest to southeast, and less in width.