Complex sentence: He was born in Bellefonte, Pennsylvania, but spent much of his childhood in the Fiji Islands, where his parents worked for the Peace Corps; this stay and the trip back to the United States through Asia, Africa, and Europe, influenced him.
Split into simpler sentences: He was born in Bellefonte, Pennsylvania, but spent much of his childhood in the Fiji Islands, where his parents worked for the Peace Corps. This experience, and the resulting trip back to the United States through Asia, Africa, and Europe, deeply influenced him.