Complex sentence: Olaf Beyer (born August 4,1957 in Grimma) was an East German 800 metres runner who won the gold medal at the 1978 European Championships in Prague.
Split into simpler sentences: Olaf Beyer (born August 4,1957 in Grimma) was an East German 800 metres runner. He won the gold medal at the 1978 European Championships in Prague.