However, as the Empire grew, the cost of maintaining communications, garrisons, civil government, etc grew to the point where new challenges, such as invasions and crop failures, became unsolvable by the acquisition of more territory.
The cost of maintaining communications grew to the point. This was however. New challenges became unsolvable by the acquisition of more territory. This was such as invasions and crop failures. The Empire grew. Communications were garrisons etc. Garrisons were civil government.