Complex sentence: While Ambassador to Czechoslovakia, he represented the United States in a long series of meetings in Geneva with the Chinese Communists, in the absence of diplomatic relations these were the principal point of contact between the two governments.
Split into simpler sentences: While Ambassador to Czechoslovakia, he represented the United States in a long series of meetings in Geneva with the Chinese Communists. In the absence of diplomatic relations these were the principal point of contact between the two governments.