Complex sentence: He started his career at the age of 15 in local club 105 Libreville, and went on to play for five years in Portuguese clubs, but in the summer of 2005 he was transferred to Deportivo Alavés.
Split into simpler sentences: He started his career at the age of 15 in local club 105 Libreville. He played for five years in Portuguese clubs, but in the summer of 2005 he was transferred to Deportivo Alavés.