Complex sentence: Cauer started off in a field completely unrelated to filters; from 1922 he worked with Max von Laue on general relativity, and his first publication (1923) was in this field.
Split into simpler sentences: Cauer started off in a field completely unrelated to filters, from 1922 he worked with Max von Laue on general relativity. His first publication (1923) was in this field.