Complex sentence: Jansson played in a variety of positions in the early stages of his career until deciding on centre back in the start of the 2010 season, he had made his first team debut as forward the year before.
Split into simpler sentences: Jansson played in a variety of positions in the early stages of his career until deciding on centre back in the start of the 2010 season. He had made his first team debut as forward the year before.