Complex sentence: In 1838, he was apprenticed to H & E Phinny, a publishing firm in Cooperstown, New York, where he learned typesetting, stereotyping, binding, and engraving.
Split into simpler sentences: In 1838, he was apprenticed to H & E Phinny, a publishing firm in Cooperstown, New York. There he learned typesetting, stereotyping, binding, and engraving.