Complex sentence: Loyalty in cities is boosted by keeping the population happy, proper government edicts, and keeping nearby cities loyal, while loyalty can be lost by other government edicts, unhappiness, and the presence of nearby opposing cities.
Split into simpler sentences: Loyalty in cities is boosted by keeping the population happy, government edicts proper, and nearby cities loyal. However, loyalty can be lost by other government edicts, unhappiness, and the presence of nearby opposing cities.