Complex sentence: Due to the complexity of the film and exacting nature of the process, the results vary widely--as with black and white negatives, the process generally results in a negative that is higher in contrast and sometimes higher in grain.
Split into simpler sentences: Due to the complexity of the film and exacting nature of the process, the results vary widely. Similar to black and white negatives the process generally results in a negative that is higher in contrast and sometimes higher in grain.