Complex sentence: During his career, he represented two national teams internationally--he appeared twice for Yugoslavia in 1991 and 69 times for Croatia between 1990 and 2002, scoring 1 goal (for Yugoslavia) and 45 goals respectively.
Split into simpler sentences: During his career, he represented two national teams internationally. He appeared twice for Yugoslavia in 1991 and 69 times for Croatia between 1990 and 2002, scoring 1 goal (for Yugoslavia) and 45 goals respectively.