Complex sentence: The first U.S. President to visit independent Croatia was Bill Clinton on 13 January 1996, who spent a few hours on the Zagreb Airport while returning from his visit to IFOR in Tuzla, Bosnia-Herzegovina.
Split into simpler sentences: The first U.S. President to visit independent Croatia was Bill Clinton on 13 January 1996. Clinton spent a few hours on the Zagreb Airport while returning from visiting IFOR troops in Tuzla, Bosnia-Herzegovina.