Complex sentence: After the war Timmes studied Russian language at the Army's Defense Language Institute at the Presidio of Monterey, California and Russian history at Columbia University and these studies prevented him from taking part in the Korean War.
Split into simpler sentences: After the war Timmes studied the Russian language at the Army's Defense Language Institute at the Presidio of Monterey, California and Russian history at Columbia University. These studies prevented him from taking part in the Korean War.