Complex sentence: So far these predictions have failed to materialize, "Mittelstand" companies continue to employ 70% of Germany's workforce and contribute 50% to its gross domestic product (GDP, $3.3 trillion).
Split into simpler sentences: So far these predictions have failed to materialize, "Mittelstand" companies continue to employ 70% of Germany's workforce. However, they contribute only 50% of its gross domestic product (GDP, $3.3 trillion).