Complex sentence: Arnaldo Abrantes is a Portuguese sprinter (100 and 200 metres), and an athlete of Sporting Clube de Portugal, who made his international debut at the 2007 World Championships in Athletics in Osaka.
Split into simpler sentences: Arnaldo Abrantes is a Portuguese sprinter (100 and 200 metres), and an athlete of Sporting Clube de Portugal. He made his international debut at the 2007 World Championships in Athletics in Osaka.