Complex sentence: Fux's work repeated some of Diruta's, possibly coincidentally, since he is not known to have had a copy: in any event, Fux presented the idea with a clarity and focus which made it famous as a teaching method.
Split into simpler sentences: Fux's work repeated some of Diruta's, possibly coincidentally, since he is not known to have had a copy. In any event, Fux presented the idea with a clarity and focus which made it famous as a teaching method.