Complex sentence: Bannout first moved to Detroit, Michigan, in the United States, he competed at the amateur level and achieved IFBB pro status by winning the light-heavyweight class at the 1979 IFBB World Amateur Championships.
Split into simpler sentences: Bannout first moved to Detroit, Michigan, in the United States. He competed at the amateur level and achieved IFBB pro status by winning his light-heavyweight class at the 1979 IFBB World Amateur Championships.