Complex sentence: At age seven he returned with his family to Canada, though having moved in the middle of a school season, he spent much of his time that year at home, watching Hanna-Barbera cartoons and drawing them.
Split into simpler sentences: At age seven he returned with his family to Canada. Having moved in the middle of a school season, he spent much of his time that year at home, watching Hanna-Barbera cartoons and drawing them.