Complex sentence: Many of the several hundred temple mounds have been covered over with freeways, shopping centers, businesses, luxury hotels and residential areas, but the central ceremonial center of Kaminaljuyu was protected by the Guatemalan government and is now a park.
Split into simpler sentences: Many of the outlying ruins, along with several hundred temple mounds, were covered over with freeways, shopping centers, businesses, luxury hotels and residential areas. However, the central ceremonial center of Kaminaljuyu came under the protection of the Guatemalan government and is now a park.