Complex sentence: From 1963-65, Mạnh was the deputy chief of the Bạch Thông wood exploitation team; he later returned to his studies, learning Russian at the Hanoi Foreign Languages College (from 1965-66).
Split into simpler sentences: From 1963-65, Mạnh was the deputy chief of the Bach Thong wood exploitation team. He later returned to his studies, and learned Russian at the Hanoi Foreign Languages College (from 1965-66).