Complex sentence: From July 2013 to July 2014 the population grew by 5.1%, making it the fourth-fastest growing county with at least 10,000 inhabitants, and in 2014 it became the fastest growing county in Alabama.
Split into simpler sentences: From July 2013 to July 2014 the population grew by 5.1%, making it the fourth-fastest growing county with at least 10,000 inhabitants. In 2014 it became the fastest growing county in Alabama.