The social obligations that scientists have as distinct from those responsibilities they share with all citizens comes from them having access to specialised knowledge of how the world works, not easily accessible to others. (source)
All citizens share some responsibilities. Scientists have some additional social obligations. This is because they have access to specialized knowledge of how the world works. This information is not easily accessible to others.
I'm guessing the as distinct from tripped you up there, perhaps along with the rather meandering sentence structure.