Complex sentence: This presented the race with a distinct edge over the Goa'uld, but when the parasitic species learned of it they forced Aris Boch's race into subordination, and conceived the drug roshnah.
Split into simpler sentences: This presented the race with a distinct edge over the Goa'uld. But when the parasitic species learned of it they forced Aris Boch's race into subordination, and conceived the drug roshnah.