Complex sentence: Between 1975 and 1990 he worked with advertising as a TV director at Movie&Art, which he co-founded with the still current CEO Paulo Dantas, selling his share of the company just before moving to Portugal in 1991.
Split into simpler sentences: Between 1975 and 1990 he worked in advertising as a TV director at Movie&Art, which he co-founded with the current CEO Paulo Dantas. He sold his share of the company just before moving to Portugal in 1991.