Complex sentence: An economist from New Zealand, A. W. Phillips (Alban William Houego) contributed the Phillips Curve to macroeconomics his model shows a trade-off between unemployment and inflation rates, this relationship can often be observed in real world historical data.
Split into simpler sentences: An economist from New Zealand, A. W. Phillips (Alban William Houego), contributed to modern macroeconomics with the Phillips Curve. His model shows a trade-off between unemployment and inflation rates, and this relationship can often be observed in real-world historical data.