Complex sentence: During the late 1960s he made many field trips included those to South India and from 1965-66 he was a temporary professor in Dravidian studies at the University of Chicago in the United States and visited the University of Heidelberg between 1967 and 1968.
Split into simpler sentences: During the late 1960s he made many field trips including those to South India. From 1965-1966 he was a temporary professor in Dravidian studies at the University of Chicago in the United States and was a visiting professor at the University of Heidelberg between 1967 and 1968.