Complex sentence: One of the earliest maps of New England, produced by cartographer Giacomo Gastaldi, erroneously identified Cape Breton with the Narragansett Bay; the resulting map completely omits most of the New England coast.
Split into simpler sentences: One of the earliest maps of New England was produced by cartographer Giacomo Gastaldi and erroneously identified Cape Breton with the Narragansett Bay. The resulting map completely omits most of the New England coast.