Complex sentence: He was later insturction in hatmaking by an older brother and apparently practiced this with some success during his teen years but just before turning 20 left Pennsylvania for Lexington, Kentucky, where an older sister had recently been widowed.
Split into simpler sentences: He was later instructed in hatmaking by an older brother and apparently practiced this trade with some success during his teen years. Just before turning 20 left Pennsylvania for Lexington, Kentucky, where an older sister had recently been widowed.