Complex sentence: David came back to the USA in 2006 and in 2007 he became a professional MMA fighter; that same year he was featured in the MMA Authority Magazine as the new up and coming fighter, and was described by the magazine as the "Brazilian Prodigy".
Split into simpler sentences: David came back to the USA in 2006 and became a professional MMA fighter. In 2007 he was featured in the MMA Authority Magazine as the new up and coming fighter, and was described by the magazine as the "Brazilian Prodigy".