Complex sentence: While at SWTSU, Scoggins nearly qualified for a spot on the 1980 Olympic diving team; however, if she had done so, then she would not have competed because the United States boycotted the Olympics that year.
Split into simpler sentences: While at SWTSU, Scoggins nearly qualified for a spot on the 1980 Olympic diving team. However, if she had done so she would not have competed as the United States boycotted the Olympics that year.