Complex sentence: During the 1970s and 1980s an increasing proportion of the work of the school shifted to Southeast Asia and many scholarly books, journal articles and other studies were produced following research in countries such as Indonesia, Thailand, the Philippines, Vietnam, and so on.
Split into simpler sentences: During the 1970s and 1980s an increasing proportion of the work of the school shifted to Southeast Asia. Many scholarly books, journal articles and other studies were produced following research in countries such as Indonesia, Thailand, the Philippines, Vietnam, and so on.