Complex sentence: He returned to the United States to head the USIA's division for the Near East, South Asia and North Africa in the late 1960s and early 1970s and was then posted to Moscow as Press and Cultural Affairs Officer.
Split into simpler sentences: He returned to the United States to head the USIA's division for the Near East, South Asia and North Africa in the late 1960s and early 1970s. Later, he was posted to Moscow as Press and Cultural Affairs Officer.