Complex sentence: His new concerns were indicated in the 1966 German collection Anamnesis: "Zur Theorie der Geschichte und Politik", and the fourth volume, "The Ecumenic Age", appeared in 1974.
Split into simpler sentences: His new concerns were indicated in the 1966 German collection Anamnesis: "Zur Theorie der Geschichte und Politik". The fourth volume, "The Ecumenic Age", appeared in 1974.