Complex sentence: In 2004, Hohmann signed on to be managed by US-and South Korea-based event promotions company Dragon Promotions, who transplanted the German-resident champion to Jacksonville, Florida, as a base of practice and preparation for US competitions.
Split into simpler sentences: In 2004, Hohmann signed on to be managed with US-and South Korea-based event promotions company Dragon Promotions. His management then transplanted the German-resident champion to Jacksonville, Florida, as a base of practice and preparation for US competitions.