Complex sentence: During World War II, then-General Eisenhower was also deeply impressed with the German auto-bahn network, and the experiences combined to convince him the need to support construction of the Interstate Highway System when he became President of the United States in 1952.
Split into simpler sentences: During World War II, then-General Eisenhower was also deeply impressed with the German autobahn roadway network. Those experiences combined to convince him the need to support construction of the Interstate Highway System when he became President of the United States in 1952.