Complex sentence: They also oppose the use of C.A.R.D. technology due to its unpredictability and how little is still known of the germ, but use a stolen version of the technology themselves in order to be able to compete with Heroside.
Split into simpler sentences: They also oppose the use of C.A.R.D. technology due to its unpredictability and the lack of complete understanding of the germ. They still, however, use a stolen version of the technology in order to be able to compete with Heroside.