Complex sentence: Master Lee served as an Instructor with the 1st Special Forces Group in the Korean Army, and has taught martial arts to the Police Departments in Seoul as well as Plainfield, New Jersey.
Split into simpler sentences: Master Lee served as an Instructor with the 1st Special Forces Group in the Korean Army, and taught martial arts to the Police Departments in Seoul. Grand Master Lee taught martial arts to the Police Department in Plainfield, New Jersey.