Complex sentence: Zingales writes that the U.S. government's role in the economy has risen significantly, with between 1900 and 2005 the fraction of GDP controlled by state hiking up eightfold, and he states that big businesses have used this to their advantage.
Split into simpler sentences: Zingales writes that the U.S. government's role in the economy has risen significantly between 1900 and 2005, with the fraction of GDP controlled by state rising eightfold. He states that big businesses have used this to their advantage.