Complex sentence: Previously, Finnieston was an area of warehouses and docks--the film Deathwatch (aka "La Mort en Direct"), used this aspect extensively in location shots.
Split into simpler sentences: Previously, Finnieston was an area of warehouses and docks. A snapshot of how Finnieston used to look can be seen in the film Deathwatch (aka "La Mort en Direct"), which used the area extensively in location shots.