Complex sentence: Publius Cornelius Scipio, the consul who commanded the Roman force sent to intercept Hannibal, and Scipio Africanus' father, had not expected Hannibal to make an attempt to cross the Alps, since the Romans were prepared to fight the war in Iberia.
Split into simpler sentences: Publius Cornelius Scipio was the consul who commanded the Roman force sent to intercept Hannibal (he was also Scipio Africanus' father). He had not expected Hannibal to make an attempt to cross the Alps, since the Romans were prepared to fight the war in Iberia.