Complex sentence: He rarely took holidays, in addition to his prosecuting work, he built up a reputation in licensing law, these cases were usually held in a separate legal term, in August, so this did not interfere with his regular work.
Split into simpler sentences: He rarely took holidays, and in addition to his prosecuting work, he built up a reputation in licensing law. These cases were usually held in a separate legal term, in August, so this did not interfere with his regular work.