Complex sentence: In 1524, Florentine explorer Giovanni da Verrazzano sailed north along the Atlantic seaboard and into New York Harbor, however he did not sail up the Hudson River, and he left the harbor shortly thereafter.
Split into simpler sentences: In 1524, Florentine explorer Giovanni da Verrazzano visited the bay of New York, sailing north along the Atlantic seaboard to New York Harbor. He sailed into the harbor, however he did not sail up the Hudson River, and he left the harbor shortly thereafter.