The relaxation of regulations governing the manufacture and sale of new medicines to increase their availability should not be accompanied by a lifting of all regulations that restrict industrial activity generally.
Conclusion (should)
As we relax the regulations on making/selling new meds (to increase their availability), we should not simultaneously deregulate all industrial activity, in general.
Intermediate Conclusion
Deregulating in general could actually undermine the original intent of relaxing regulations on making/selling new meds (increasing their availability).
Evidence (since)
A large majority of new meds are derived from plants and animals, and if we got rid of our strict environmental regulations, endangered plants and animals would become extinct.
Evaluate
Whenever we're reading Main Conclusion or Role, we're priming our brain with the reminder that the Main Conclusion is usually earlier in the paragraph than are its Supporting Ideas.
We want to always read the first sentence of Main Conclusion/Role with the suspicion that it may be the Main Conclusion. If it sounds like an opinion belonging to our author, and our author goes on to try supporting it, then we correctly "hear" the conclusion from the start.
In this case, the "should" told us that yes, indeed, the first sentence was the author's opinion and therefore most likely the Main Conclusion.
The "since" in the final sentence tells us that the first half of that sentence is supporting a Conclusion in the second half. But the second half of that last sentence is still Support for our first sentence.
Goal
They're asking us about the "since" claim, so from our four main buckets (Main Conclusion, Support, Opposing, Neutral), we know to choose Support.
Any claim attached to FABS (for, after all, because, since) will be playing a Support role.
But if we wanted to get more technical with our prediction, this "since" claim is supporting the Intermediate Conclusion (the final claim of the paragraph), which supports the Main Conclusion in the first sentence.