Complex sentence: When his associate left Boston after being acquitted of murder in a political quarrel, he practiced alone for fifteen years; about 1822 he took Sidney Bartlett, an able trial lawyer, as his junior partner.
Split into simpler sentences: When his associate left Boston after being acquitted of murder in a political quarrel, he practiced alone for fifteen years. In about 1822, he took Sidney Bartlett, an able trial lawyer, as his junior partner.