Complex sentence: The first Memorijal Hakija Turajlić was held in 1994, during the Siege of Sarajevo, and since then more than 400 boxers from 30 countries have participated in the tournament.
Split into simpler sentences: The first Memorijal Hakija Turajlić was held in 1994, during the Siege of Sarajevo. Since 1994 more than 400 boxers from 30 countries have participated in the tournament.