Complex sentence: Debt burden is usually measured as a ratio of public debt to gross domestic product; the U.S. debt/GDP ratio reached a maximum during World War II near the beginning of President Harry Truman's first presidential term.
Split into simpler sentences: Debt burden is usually measured as a ratio of public debt to gross domestic product. The U.S. debt/GDP ratio reached a maximum during World War II near the beginning of President Harry Truman's first presidential term.