Complex sentence: In the decades since, Fischer's charge of war origin has generated substantial controversy and divided historians, e.g., many coming to view Fischer's example of the Septemberprogramm as only a discussion document never formally adopted.
Split into simpler sentences: In the decades since, Fischer's charge of war origin has generated substantial controversy and divided historians. Many came to view Fischer's example of the Septemberprogramm as only a discussion document never formally adopted.