Complex sentence: He is an alumni of Internationales Institut fur Journalismus (G57 course, 1990), and a full-time journalist since 1983, he has been freelancing since end-1994.
Split into simpler sentences: He is an alumnus of the Internationales Institut fur Journalismus (G57 course, 1990), and a full-time journalist since 1983. He has been freelancing since end-1994.