Complex sentence: From the 11th to the 14th century, Oegstgeest enjoyed a period of progress which ended when Leiden became a city and trades and construction was no longer permitted within a certain distance from the city.
Split into simpler sentences: From the 11th to the 14th century, Oegstgeest enjoyed a period of progress. The carrying out of trades and construction were no longer permitted within a certain distance from the city.