Complex sentence: Petković debuted for FR Yugoslavia in 1995, but he played only a few matches due to disagreements with the coach Slobodan Santrač, who did not call him for 1998 FIFA World Cup.
Split into simpler sentences: Petković debuted for FR Yugoslavia in 1995, but only played a few matches due to disagreements with then coach Slobodan Santrač. Santrač additionally did not call him for the 1998 FIFA World Cup.