Complex sentence: He participated in the 2004 Summer Olympics for his native North African country; however, he did not continue past the first round of the Featherweight (57 kg) division after being defeated by Russia's eventual winner Alexei Tichtchenko.
Split into simpler sentences: He participated in the 2004 Summer Olympics for his native North African country. There he was stopped in the first round of the Featherweight (57 kg) division by Russia's eventual winner Alexei Tichtchenko.