Complex sentence: Specifically, Hagenbach was put on trial for atrocities committed during the occupation of Breisach, under his command but not by him directly, the earliest modern European example of the doctrine of command responsibility.
Split into simpler sentences: Specifically, Hagenbach was put on trial for atrocities committed under his command but not by him directly, during the occupation of Breisach. This was the earliest modern European example of the doctrine of command responsibility.