Complex sentence: In the film Gilligan and Traynor are not portrayed as "Cahill's underlings"; indeed, Gilligan appears as a separate crimelord, and Traynor as a lower level associate.
Split into simpler sentences: In the film Gilligan and Traynor are not portrayed as Cahill's subordinates. Instead, Gilligan appears as a rival mob boss, and Traynor as a lower level associate.