Complex sentence: The country's economic recovery was, once it was permitted, swift and effective; during the mid- 1950s, the unemployment rate in Germany was so low that it led to the influx of Turkish immigrants into the country's labor force.
Split into simpler sentences: The country's economic recovery was, once it was permitted, swift and effective. During the mid- 1950s, the unemployment rate in Germany was so low that it led to the influx of Turkish immigrants into the country's labor force.