Complex sentence: In June 1999, she was "briefly detained" at Atlanta's airport, she had declared $500 worth of merchandise on her US Customs form, but receipts indicated that she was carrying "$19,000 worth of clothing and jewelry".
Split into simpler sentences: In June 1999, she was "briefly detained" at Atlanta's airport. She had declared $500 worth of merchandise on her US Customs form, but receipts indicated that she was carrying "$19,000 worth of clothing and jewelry".