Complex sentence: She won the triple jump silver medal at the 2004 Summer Olympics with 15.25 and the triple jump bronze medal at the 2008 Summer Olympics while on the semifinal she set a Greek record of 15.32 metres.
Split into simpler sentences: She won the triple jump silver medal at the 2004 Summer Olympics with 15.25 and the triple jump bronze medal at the 2008 Summer Olympics. On the 2004 Summer Olympics semifinal she set a Greek record of 15.32 metres.