Complex sentence: He began work in an auger factory at an early age in Hamden, Connecticut, and continued until he was seventeen years old, when he purchased a clock store, which he traded for horses in Vermont and Canada.
Split into simpler sentences: He began work in an auger factory in Hamden, Connecticut at an early age and continued until he was seventeen years old. At that time, he purchased a clock store, which he traded for horses in Vermont and Canada.