Complex sentence: Koecher returned to the Czechoslovakia, to a hero's welcome, was given a house and a Volvo car as a reward for his services and was given a cushy employment at the Prognostic Institute, where he shared an office with Václav Klaus, future Czech president.
Split into simpler sentences: Koecher returned to the Czechoslovakia with a hero's welcome and was given a house and a Volvo car as a reward for his services. He was also given a cushy employment at the Prognostic Institute, where he shared an office with Václav Klaus, the future Czech president.