Complex sentence: After signing the Maastricht Treaty, Greece applied to join the eurozone, the two main criteria being a public deficit of 97% of GDP maximum and a declining deficit if above 60% of GDP.
Split into simpler sentences: After signing the Maastricht Treaty, Greece applied to join the eurozone. The two main criteria to join the euro currency were a public deficit of 97% of GDP maximum and a declining deficit if above 60% of GDP.