Complex sentence: Eich received numerous literary prizes after World War II including one from the literary association of which he was a member, Gruppe 47 in 1950, the Georg-Büchner-Preis in 1959, and the Schiller-Gedächtnispreis in 1968.
Split into simpler sentences: Eich received numerous literary prizes after World War II, including one from the literary association of which he was a member, Gruppe 47, in 1950. Eich also won the Georg-Büchner-Preis in 1959 and the Schiller-Gedächtnispreis in 1968.