Complex sentence: He returned to Afghanistan in 1974 to teach Afghan studies and anthropology at Kabul University before winning a government scholarship in 1977 to study for a Master's degree in anthropology at Columbia University, intending to be away for two years.
Split into simpler sentences: He returned to Afghanistan in 1974 to teach Afghan studies and anthropology at Kabul University before winning a government scholarship to study for a Master's degree in anthropology at Columbia University in the United States. He left Afghanistan in 1977, intending to be away for two years.