Context: In the good old days youngsters learned oratory by apprenticeship to outstanding members of the bar, but in these degraded times the training is the business of so-called professors of rhetoric. Declamations practiced in their schools are unrealistic.
sequitur autem, ut materiae abhorrenti a veritate [5] declamatio quoque adhibeatur.
Translation: It follows moreover [sequitur autem], that the declamation [form] is also [quoque] applied to [adhibeatur] subject matter quite remote from the real world.
This short sentence baffled me until I tried reading sequitur as impersonal.
materiae abhorrenti: dative complement of passive verb adhibeatur