Complex sentence: After completing the film in 1960, Anderson had a difficult time getting a distributor to pick up her film so she began showing it at churches and colleges before it was finally picked up by Columbia University's distribution outlet.
Split into simpler sentences: After completing the film in 1960, Anderson had a difficult time getting a distributor to pick it up so she began exhibiting it at churches and colleges. It wasn't too long before the film was eventually picked up by Columbia University's distribution outlet.