Complex sentence: Stefano Baldini (born 25 May 1971 in Castelnovo di Sotto, Emilia-Romagna, Italy) is a retired Italian athlete who specialized in the marathon, Olympic champion in Athens 2004 and twice European champion (1998 and 2006).
Split into simpler sentences: Stefano Baldini (born 25 May 1971 in Castelnovo di Sotto, Emilia-Romagna, Italy) is a retired Italian runner who specialized in the marathon. He was the Olympic champion in Athens and was twice European champion (1998 and 2006).