Complex sentence: The "Northern Light" was an American clipper ship that, in 1853, sailed from San Francisco, California to Boston, Massachusetts via Cape Horn in a record-setting 76 days, 6 hours.
Split into simpler sentences: The "Northern Light" was an American clipper ship. In 1853 it sailed from San Francisco, California to Boston, Massachusetts via Cape Horn in a record-setting 76 days, 6 hours.