Complex sentence: Aberg played Heathcliff while co-star Ingrid Superstar was Cathy, although his first encounter with Warhol was in February of 1966, a few weeks before "Sights" was filmed.
Split into simpler sentences: Aberg played Heathcliff while co-star Ingrid Superstar was Cathy. Althugh his first encounter with Warhol was in February of 1966, a few weeks before "Sights" was filmed.