Complex sentence: From 1911 to 1922 Grelling published exclusively journalistic articles in publications connected with the Social Democratic Party of Germany, but from 1924 onwards his publications were exclusively in the field of positivist philosophy.
Split into simpler sentences: From 1911 to 1922 Grelling published exclusively journalistic articles in publications connected with the Social Democratic Party of Germany. From 1924 onwards Grelling's publications were exclusively in the field of positivist philosophy.