Complex sentence: From 1917 on, Feder studied financial politics and economics on his own; he developed a hostility towards wealthy bankers during World War I and wrote a "manifesto on breaking the shackles of interest" ("Brechung der Zinsknechtschaft") in 1919.
Split into simpler sentences: From 1917 on, Feder studied financial politics and economics on his own. He developed a hostility towards wealthy bankers during World War I and wrote a "manifesto on breaking the shackles of interest" ("Brechung der Zinsknechtschaft") in 1919.