Complex sentence: Le Geyt then discovered that "Stork" drew too much water to permit her to enter the Gulf of Batabanó so he reinforced the other three vessels with his boats and men and sent in a cutting-out expedition under Captain Edward Rushworth of "Superieure".
Split into simpler sentences: Le Geyt then discovered that "Stork" drew too much water to permit her to enter the Gulf of Batabanó. He therefore transferred to the other three vessels his boats and men and sent in the cutting-out expedition under the command of Commander Edward Rushworth of "Superieure".