Complex sentence: Initially a journalist, Oehler turned his attention towards producing vehemently pro-German material, founding the "Schweizerische Monatshefte für Politik und Kultur" (SM) in 1921.
Split into simpler sentences: Initially a journalist, Oehler turned his attention towards producing vehemently pro-German material. He was one of the founders of the "Schweizerische Monatshefte für Politik und Kultur" (SM) in 1921.