Complex sentence: Among his other contributions apart from the rudiments of a purchasing power parity theory of exchange rates (1921), he produced an'overconsumption' theory of the trade cycle (1918) and Nature and Necessity of Interest (1903).
Split into simpler sentences: Among his other contributions apart from the rudiments of a purchasing power parity theory of exchange rates (1921). He produced an'overconsumption' theory of the trade cycle (1918) and Nature and Necessity of Interest (1903).