Complex sentence: He attended the common schools and studied law, being admitted to the bar in 1845 beginning a practice in Oshkosh, Wisconsin, in 1846, while also owning a general merchandise business with Edward Eastman, a fellow emigrant from Vermont.
Split into simpler sentences: He attended the common schools and studied law, being admitted to the bar in 1845. He began a law practice in Oshkosh, Wisconsin, in 1846, while also owning a general merchandise business with Edward Eastman, a fellow emigrant from Vermont.