Complex sentence: Immediately after graduation, she lived in France with two of her friends, and upon returning to the States, she got an internship in Washington, D.C. with a congressman, and later with a Minnesota senator.
Split into simpler sentences: Immediately after graduation, she lived in France with two of her friends. Upon returning to the States, she got an internship in Washington, D.C. with a congressman, and later with a Minnesota senator.