Complex sentence: Structural changes in industry and the strong development of the service industry has radically changed the city's economic base, and now represents the industry's share of employment over 11 percent, but the city still has 29 percent of the county's industrial employment.
Split into simpler sentences: Structural changes in industry and the strong development of the service industry has radically changed the city's economic base, and the service industry now represents over 11 percent of employment. However, the city still has 29 percent of the county's industrial employment.