Complex sentence: Four years later, he received his J.D. from the Georgetown University Law Center, was admitted to the Maryland Bar Association, and after leaving his father's law firm, subsequently started his own one-lawyer law firm in Columbia.
Split into simpler sentences: Four years later, he received his J.D. from the Georgetown University Law Center, was admitted to the Maryland Bar Association. After leaving his father's law firm, subsequently started his own one-lawyer law firm in Columbia.