Complex sentence: He began to study and practice Taekwondo as a boy, and in 1976, following a year of military service, joined his brother, Songahm Taekwondo Haeng Ung Lee in the United States.
Split into simpler sentences: He began to study and practice Taekwondo as a boy. In 1976, following a year of military service, joined his brother, Songahm Taekwondo Haeng Ung Lee in the United States.