Complex sentence: In the 1920s, Steiner was approached by Friedrich Rittelmeyer, a Lutheran pastor with a congregation in Berlin, who asked if it was possible to create a more modern form of Christianity.
Split into simpler sentences: In the 1920s, Steiner was approached by Friedrich Rittelmeyer, a Lutheran pastor with a congregation in Berlin. Rittelmeyer asked if it was possible to create a more modern form of Christianity.