Complex sentence: In 1869 she was both a teacher and a student at Howard University, she studied law, specialising in commercial law, and graduated in February of 1872 and was the first woman to graduate from the Howard Law School.
Split into simpler sentences: In 1869 she was both a teacher and a student at Howard University. In the law school she specialized in commercial law, and graduated in February of 1872 and was the first woman to graduate from the Howard Law School.