Complex sentence: He came under intense scrutiny after the media discovered that he was romantically linked to Julie Couillard, a former model who had past romantic links with members of the Hells Angels.
Split into simpler sentences: He came under intense scrutiny after the media discovered that he was romantically linked to a woman, Julie Couillard, who had ties to the Hell's Angels. Couillard is a former model, who had past romantic links with members of the Hells Angels.